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853 lines
27 KiB
853 lines
27 KiB
// Boost.Range library
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//
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// Copyright Neil Groves & Thorsten Ottosen & Pavol Droba 2003-2004.
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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// Credits:
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// 'michel' reported Trac 9072 which included a patch for allowing references
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// to function types.
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//
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#ifndef BOOST_RANGE_ITERATOR_RANGE_CORE_HPP_INCLUDED
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#define BOOST_RANGE_ITERATOR_RANGE_CORE_HPP_INCLUDED
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#include <boost/config.hpp> // Define __STL_CONFIG_H, if appropriate.
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#include <boost/detail/workaround.hpp>
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#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1500))
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#pragma warning( push )
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#pragma warning( disable : 4996 )
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#endif
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#include <boost/assert.hpp>
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#include <boost/iterator/iterator_traits.hpp>
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#include <boost/iterator/iterator_facade.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/type_traits/is_abstract.hpp>
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#include <boost/type_traits/is_array.hpp>
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#include <boost/type_traits/is_base_and_derived.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/is_pointer.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/range/functions.hpp>
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#include <boost/range/iterator.hpp>
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#include <boost/range/difference_type.hpp>
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#include <boost/range/has_range_iterator.hpp>
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#include <boost/range/algorithm/equal.hpp>
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#include <boost/range/detail/safe_bool.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/next_prior.hpp>
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#include <iterator>
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#include <algorithm>
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#include <cstddef>
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/*! \file
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Defines the \c iterator_class and related functions.
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\c iterator_range is a simple wrapper of iterator pair idiom. It provides
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a rich subset of Container interface.
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*/
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namespace boost
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{
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namespace iterator_range_detail
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{
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//
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// The functions adl_begin and adl_end are implemented in a separate
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// class for gcc-2.9x
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//
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template<class IteratorT>
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struct iterator_range_impl {
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template< class ForwardRange >
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static IteratorT adl_begin( ForwardRange& r )
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{
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return IteratorT( boost::begin( r ) );
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}
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template< class ForwardRange >
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static IteratorT adl_end( ForwardRange& r )
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{
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return IteratorT( boost::end( r ) );
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}
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};
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template< class Left, class Right >
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inline bool less_than( const Left& l, const Right& r )
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{
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return std::lexicographical_compare( boost::begin(l),
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boost::end(l),
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boost::begin(r),
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boost::end(r) );
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}
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template< class Left, class Right >
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inline bool greater_than( const Left& l, const Right& r )
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{
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return iterator_range_detail::less_than(r,l);
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}
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template< class Left, class Right >
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inline bool less_or_equal_than( const Left& l, const Right& r )
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{
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return !iterator_range_detail::less_than(r,l);
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}
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template< class Left, class Right >
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inline bool greater_or_equal_than( const Left& l, const Right& r )
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{
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return !iterator_range_detail::less_than(l,r);
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}
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// This version is maintained since it is used in other boost libraries
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// such as Boost.Assign
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template< class Left, class Right >
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inline bool equal(const Left& l, const Right& r)
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{
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return boost::equal(l, r);
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}
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struct range_tag
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{
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};
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struct const_range_tag
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{
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};
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struct iterator_range_tag
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{
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};
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typedef char (&incrementable_t)[1];
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typedef char (&bidirectional_t)[2];
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typedef char (&random_access_t)[3];
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incrementable_t test_traversal_tag(boost::incrementable_traversal_tag);
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bidirectional_t test_traversal_tag(boost::bidirectional_traversal_tag);
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random_access_t test_traversal_tag(boost::random_access_traversal_tag);
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template<std::size_t S>
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struct pure_iterator_traversal_impl
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{
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typedef boost::incrementable_traversal_tag type;
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};
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template<>
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struct pure_iterator_traversal_impl<sizeof(bidirectional_t)>
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{
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typedef boost::bidirectional_traversal_tag type;
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};
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template<>
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struct pure_iterator_traversal_impl<sizeof(random_access_t)>
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{
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typedef boost::random_access_traversal_tag type;
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};
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template<typename IteratorT>
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struct pure_iterator_traversal
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{
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typedef
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BOOST_DEDUCED_TYPENAME iterator_traversal<IteratorT>::type
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traversal_t;
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BOOST_STATIC_CONSTANT(
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std::size_t,
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traversal_i = sizeof(iterator_range_detail::test_traversal_tag((traversal_t())))
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);
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typedef
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BOOST_DEDUCED_TYPENAME pure_iterator_traversal_impl<traversal_i>::type
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type;
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};
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template<class IteratorT, class TraversalTag>
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class iterator_range_base
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: public iterator_range_tag
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{
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typedef range_detail::safe_bool<
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IteratorT iterator_range_base<IteratorT, TraversalTag>::*
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> safe_bool_t;
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typedef iterator_range_base<IteratorT, TraversalTag> type;
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protected:
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typedef iterator_range_impl<IteratorT> impl;
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public:
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typedef BOOST_DEDUCED_TYPENAME
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safe_bool_t::unspecified_bool_type unspecified_bool_type;
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typedef BOOST_DEDUCED_TYPENAME
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iterator_value<IteratorT>::type value_type;
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typedef BOOST_DEDUCED_TYPENAME
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iterator_difference<IteratorT>::type difference_type;
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typedef std::size_t size_type; // note: must be unsigned
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// Needed because value-type is the same for
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// const and non-const iterators
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typedef BOOST_DEDUCED_TYPENAME
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iterator_reference<IteratorT>::type reference;
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//! const_iterator type
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/*!
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There is no distinction between const_iterator and iterator.
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These typedefs are provides to fulfill container interface
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*/
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typedef IteratorT const_iterator;
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//! iterator type
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typedef IteratorT iterator;
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protected:
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iterator_range_base()
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: m_Begin()
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, m_End()
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{
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}
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template<class Iterator>
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iterator_range_base(Iterator Begin, Iterator End)
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: m_Begin(Begin)
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, m_End(End)
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{
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}
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public:
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IteratorT begin() const
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{
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return m_Begin;
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}
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IteratorT end() const
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{
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return m_End;
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}
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bool empty() const
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{
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return m_Begin == m_End;
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}
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operator unspecified_bool_type() const
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{
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return safe_bool_t::to_unspecified_bool(
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m_Begin != m_End, &iterator_range_base::m_Begin);
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}
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bool operator!() const
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{
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return empty();
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}
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bool equal(const iterator_range_base& r) const
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{
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return m_Begin == r.m_Begin && m_End == r.m_End;
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}
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reference front() const
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{
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BOOST_ASSERT(!empty());
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return *m_Begin;
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}
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void drop_front()
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{
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BOOST_ASSERT(!empty());
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++m_Begin;
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}
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void drop_front(difference_type n)
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{
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BOOST_ASSERT(n >= difference_type());
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std::advance(this->m_Begin, n);
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}
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// Deprecated
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void pop_front() { drop_front(); }
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protected:
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template<class Iterator>
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void assign(Iterator first, Iterator last)
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{
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m_Begin = first;
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m_End = last;
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}
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template<class SinglePassRange>
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void assign(const SinglePassRange& r)
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{
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m_Begin = impl::adl_begin(r);
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m_End = impl::adl_end(r);
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}
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template<class SinglePassRange>
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void assign(SinglePassRange& r)
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{
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m_Begin = impl::adl_begin(r);
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m_End = impl::adl_end(r);
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}
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IteratorT m_Begin;
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IteratorT m_End;
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};
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template<class IteratorT>
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class iterator_range_base<IteratorT, bidirectional_traversal_tag>
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: public iterator_range_base<IteratorT, incrementable_traversal_tag>
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{
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typedef iterator_range_base<IteratorT, incrementable_traversal_tag> base_type;
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protected:
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iterator_range_base()
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{
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}
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template<class Iterator>
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iterator_range_base(Iterator first, Iterator last)
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: base_type(first, last)
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{
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}
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public:
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typedef BOOST_DEDUCED_TYPENAME base_type::difference_type difference_type;
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typedef BOOST_DEDUCED_TYPENAME base_type::reference reference;
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reference back() const
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{
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BOOST_ASSERT(!this->empty());
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return *boost::prior(this->m_End);
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}
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void drop_back()
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{
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BOOST_ASSERT(!this->empty());
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--this->m_End;
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}
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void drop_back(difference_type n)
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{
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BOOST_ASSERT(n >= difference_type());
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std::advance(this->m_End, -n);
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}
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// Deprecated
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void pop_back() { drop_back(); }
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};
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template<class IteratorT>
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class iterator_range_base<IteratorT, random_access_traversal_tag>
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: public iterator_range_base<IteratorT, bidirectional_traversal_tag>
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{
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typedef iterator_range_base<
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IteratorT, bidirectional_traversal_tag> base_type;
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public:
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typedef BOOST_DEDUCED_TYPENAME
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boost::mpl::if_<
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boost::mpl::or_<
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boost::is_abstract<
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BOOST_DEDUCED_TYPENAME base_type::value_type
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>,
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boost::is_array<
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BOOST_DEDUCED_TYPENAME base_type::value_type
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>,
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boost::is_function<
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BOOST_DEDUCED_TYPENAME base_type::value_type
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>
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>,
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BOOST_DEDUCED_TYPENAME base_type::reference,
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BOOST_DEDUCED_TYPENAME base_type::value_type
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>::type abstract_value_type;
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// Rationale:
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// typedef these here to reduce verbiage in the implementation of this
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// type.
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typedef BOOST_DEDUCED_TYPENAME base_type::difference_type difference_type;
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typedef BOOST_DEDUCED_TYPENAME base_type::size_type size_type;
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typedef BOOST_DEDUCED_TYPENAME base_type::reference reference;
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protected:
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iterator_range_base()
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{
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}
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template<class Iterator>
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iterator_range_base(Iterator first, Iterator last)
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: base_type(first, last)
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{
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}
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public:
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reference operator[](difference_type at) const
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{
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BOOST_ASSERT(at >= 0);
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BOOST_ASSERT(static_cast<typename base_type::size_type>(at) < size());
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return this->m_Begin[at];
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}
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//
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// When storing transform iterators, operator[]()
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// fails because it returns by reference. Therefore
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// operator()() is provided for these cases.
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//
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abstract_value_type operator()(difference_type at) const
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{
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BOOST_ASSERT(at >= 0);
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BOOST_ASSERT(static_cast<typename base_type::size_type>(at) < size());
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return this->m_Begin[at];
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}
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BOOST_DEDUCED_TYPENAME base_type::size_type size() const
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{
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return this->m_End - this->m_Begin;
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}
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};
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}
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// iterator range template class -----------------------------------------//
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//! iterator_range class
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/*!
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An \c iterator_range delimits a range in a sequence by beginning and ending iterators.
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An iterator_range can be passed to an algorithm which requires a sequence as an input.
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For example, the \c toupper() function may be used most frequently on strings,
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but can also be used on iterator_ranges:
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\code
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boost::tolower( find( s, "UPPERCASE STRING" ) );
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\endcode
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Many algorithms working with sequences take a pair of iterators,
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delimiting a working range, as an arguments. The \c iterator_range class is an
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encapsulation of a range identified by a pair of iterators.
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It provides a collection interface,
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so it is possible to pass an instance to an algorithm requiring a collection as an input.
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*/
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template<class IteratorT>
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class iterator_range
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: public iterator_range_detail::iterator_range_base<
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IteratorT,
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BOOST_DEDUCED_TYPENAME iterator_range_detail::pure_iterator_traversal<IteratorT>::type
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>
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{
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typedef iterator_range_detail::iterator_range_base<
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IteratorT,
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BOOST_DEDUCED_TYPENAME iterator_range_detail::pure_iterator_traversal<IteratorT>::type
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> base_type;
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template<class Source>
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struct is_compatible_range_
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: is_convertible<
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BOOST_DEDUCED_TYPENAME mpl::eval_if<
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has_range_iterator<Source>,
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range_iterator<Source>,
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mpl::identity<void>
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>::type,
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BOOST_DEDUCED_TYPENAME base_type::iterator
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>
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{
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};
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template<class Source>
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struct is_compatible_range
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: mpl::and_<
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mpl::not_<
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is_convertible<
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Source,
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BOOST_DEDUCED_TYPENAME base_type::iterator
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>
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>,
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is_compatible_range_<Source>
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>
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{
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};
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protected:
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typedef iterator_range_detail::iterator_range_impl<IteratorT> impl;
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public:
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typedef iterator_range<IteratorT> type;
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iterator_range()
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{
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}
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template<class Iterator>
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iterator_range(Iterator first, Iterator last)
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: base_type(first, last)
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{
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}
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template<class SinglePassRange>
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iterator_range(
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const SinglePassRange& r,
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BOOST_DEDUCED_TYPENAME ::boost::enable_if<
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is_compatible_range<const SinglePassRange>
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>::type* = 0
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)
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: base_type(impl::adl_begin(r), impl::adl_end(r))
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{
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}
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template<class SinglePassRange>
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iterator_range(
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SinglePassRange& r,
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BOOST_DEDUCED_TYPENAME ::boost::enable_if<
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is_compatible_range<SinglePassRange>
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>::type* = 0
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)
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: base_type(impl::adl_begin(r), impl::adl_end(r))
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{
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}
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template<class SinglePassRange>
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iterator_range(const SinglePassRange& r,
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iterator_range_detail::const_range_tag)
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: base_type(impl::adl_begin(r), impl::adl_end(r))
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{
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}
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template<class SinglePassRange>
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iterator_range(SinglePassRange& r,
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iterator_range_detail::range_tag)
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: base_type(impl::adl_begin(r), impl::adl_end(r))
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{
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}
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template<class Iterator>
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iterator_range& operator=(const iterator_range<Iterator>& other)
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{
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this->assign(other.begin(), other.end());
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return *this;
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}
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template<class Iterator>
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iterator_range& operator=(iterator_range<Iterator>& other)
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{
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this->assign(other.begin(), other.end());
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return *this;
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}
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template<class SinglePassRange>
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iterator_range& operator=(SinglePassRange& r)
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{
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this->assign(r);
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return *this;
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}
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template<class SinglePassRange>
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iterator_range& operator=(const SinglePassRange& r)
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{
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this->assign(r);
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return *this;
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}
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iterator_range& advance_begin(
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BOOST_DEDUCED_TYPENAME base_type::difference_type n)
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{
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std::advance(this->m_Begin, n);
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return *this;
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}
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iterator_range& advance_end(
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BOOST_DEDUCED_TYPENAME base_type::difference_type n)
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{
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std::advance(this->m_End, n);
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return *this;
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}
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protected:
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//
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// Allow subclasses an easy way to access the
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// base type
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//
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typedef iterator_range iterator_range_;
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};
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|
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// iterator range free-standing operators ---------------------------//
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/////////////////////////////////////////////////////////////////////
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// comparison operators
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/////////////////////////////////////////////////////////////////////
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator==( const ForwardRange& l, const iterator_range<IteratorT>& r )
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{
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return boost::equal( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator!=( const ForwardRange& l, const iterator_range<IteratorT>& r )
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{
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return !boost::equal( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator<( const ForwardRange& l, const iterator_range<IteratorT>& r )
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{
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return iterator_range_detail::less_than( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator<=( const ForwardRange& l, const iterator_range<IteratorT>& r )
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{
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return iterator_range_detail::less_or_equal_than( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator>( const ForwardRange& l, const iterator_range<IteratorT>& r )
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{
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return iterator_range_detail::greater_than( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator>=( const ForwardRange& l, const iterator_range<IteratorT>& r )
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{
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return iterator_range_detail::greater_or_equal_than( l, r );
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}
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template< class Iterator1T, class Iterator2T >
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inline bool
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operator==( const iterator_range<Iterator1T>& l, const iterator_range<Iterator2T>& r )
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{
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return boost::equal( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator==( const iterator_range<IteratorT>& l, const ForwardRange& r )
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{
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return boost::equal( l, r );
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}
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template< class Iterator1T, class Iterator2T >
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inline bool
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operator!=( const iterator_range<Iterator1T>& l, const iterator_range<Iterator2T>& r )
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{
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return !boost::equal( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator!=( const iterator_range<IteratorT>& l, const ForwardRange& r )
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{
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return !boost::equal( l, r );
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}
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template< class Iterator1T, class Iterator2T >
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inline bool
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operator<( const iterator_range<Iterator1T>& l, const iterator_range<Iterator2T>& r )
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{
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return iterator_range_detail::less_than( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator<( const iterator_range<IteratorT>& l, const ForwardRange& r )
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{
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return iterator_range_detail::less_than( l, r );
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}
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template< class Iterator1T, class Iterator2T >
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inline bool
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operator<=( const iterator_range<Iterator1T>& l, const iterator_range<Iterator2T>& r )
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{
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return iterator_range_detail::less_or_equal_than( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator<=( const iterator_range<IteratorT>& l, const ForwardRange& r )
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{
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return iterator_range_detail::less_or_equal_than( l, r );
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}
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template< class Iterator1T, class Iterator2T >
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inline bool
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operator>( const iterator_range<Iterator1T>& l, const iterator_range<Iterator2T>& r )
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{
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return iterator_range_detail::greater_than( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator>( const iterator_range<IteratorT>& l, const ForwardRange& r )
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{
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return iterator_range_detail::greater_than( l, r );
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}
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template< class Iterator1T, class Iterator2T >
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inline bool
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operator>=( const iterator_range<Iterator1T>& l, const iterator_range<Iterator2T>& r )
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{
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return iterator_range_detail::greater_or_equal_than( l, r );
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}
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template< class IteratorT, class ForwardRange >
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inline BOOST_DEDUCED_TYPENAME boost::enable_if<
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mpl::not_<boost::is_base_and_derived<iterator_range_detail::iterator_range_tag, ForwardRange> >,
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bool
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>::type
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operator>=( const iterator_range<IteratorT>& l, const ForwardRange& r )
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{
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return iterator_range_detail::greater_or_equal_than( l, r );
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}
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// iterator range utilities -----------------------------------------//
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//! iterator_range construct helper
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/*!
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Construct an \c iterator_range from a pair of iterators
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\param Begin A begin iterator
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\param End An end iterator
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\return iterator_range object
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*/
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template< typename IteratorT >
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inline iterator_range< IteratorT >
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make_iterator_range( IteratorT Begin, IteratorT End )
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{
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return iterator_range<IteratorT>( Begin, End );
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}
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template<typename IteratorT, typename IntegerT>
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inline iterator_range<IteratorT>
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make_iterator_range_n(IteratorT first, IntegerT n)
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{
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return iterator_range<IteratorT>(first, boost::next(first, n));
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}
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//! iterator_range construct helper
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/*!
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Construct an \c iterator_range from a \c Range containing the begin
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and end iterators.
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*/
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template< class ForwardRange >
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inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<ForwardRange>::type >
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make_iterator_range( ForwardRange& r )
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{
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return iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<ForwardRange>::type >
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( r, iterator_range_detail::range_tag() );
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}
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template< class ForwardRange >
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inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<const ForwardRange>::type >
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make_iterator_range( const ForwardRange& r )
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{
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return iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<const ForwardRange>::type >
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( r, iterator_range_detail::const_range_tag() );
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}
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namespace iterator_range_detail
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{
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template< class Range >
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inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<Range>::type >
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make_range_impl( Range& r,
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BOOST_DEDUCED_TYPENAME range_difference<Range>::type advance_begin,
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BOOST_DEDUCED_TYPENAME range_difference<Range>::type advance_end )
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{
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//
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// Not worth the effort
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//
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//if( advance_begin == 0 && advance_end == 0 )
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// return make_iterator_range( r );
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//
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BOOST_DEDUCED_TYPENAME range_iterator<Range>::type
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new_begin = boost::begin( r ),
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new_end = boost::end( r );
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std::advance( new_begin, advance_begin );
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std::advance( new_end, advance_end );
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return make_iterator_range( new_begin, new_end );
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}
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}
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template< class Range >
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inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<Range>::type >
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make_iterator_range( Range& r,
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BOOST_DEDUCED_TYPENAME range_difference<Range>::type advance_begin,
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BOOST_DEDUCED_TYPENAME range_difference<Range>::type advance_end )
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{
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return iterator_range_detail::make_range_impl( r, advance_begin, advance_end );
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}
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template< class Range >
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inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<const Range>::type >
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make_iterator_range( const Range& r,
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BOOST_DEDUCED_TYPENAME range_difference<Range>::type advance_begin,
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BOOST_DEDUCED_TYPENAME range_difference<Range>::type advance_end )
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{
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return iterator_range_detail::make_range_impl( r, advance_begin, advance_end );
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}
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//! copy a range into a sequence
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/*!
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Construct a new sequence of the specified type from the elements
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in the given range
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\param Range An input range
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\return New sequence
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*/
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template< typename SeqT, typename Range >
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inline SeqT copy_range( const Range& r )
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{
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return SeqT( boost::begin( r ), boost::end( r ) );
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}
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} // namespace 'boost'
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#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1500))
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#pragma warning( pop )
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#endif
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#endif
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