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115 lines
3.8 KiB
115 lines
3.8 KiB
3 years ago
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2004-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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// Contains the definition of the class template
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// boost::iostreams::detail::double_object, which is similar to compressed pair
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// except that both members of the pair have the same type, and
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// compression occurs only if requested using a boolean template
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// parameter.
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#ifndef BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <algorithm> // swap.
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#include <boost/detail/workaround.hpp>
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#include <boost/mpl/if.hpp>
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
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# include <msl_utility>
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#else
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# include <boost/call_traits.hpp>
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#endif
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namespace boost { namespace iostreams { namespace detail {
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template<typename T>
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class single_object_holder {
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public:
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
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typedef Metrowerks::call_traits<T> traits_type;
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#else
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typedef boost::call_traits<T> traits_type;
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#endif
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typedef typename traits_type::param_type param_type;
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typedef typename traits_type::reference reference;
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typedef typename traits_type::const_reference const_reference;
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single_object_holder() { }
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single_object_holder(param_type t) : first_(t) { }
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reference first() { return first_; }
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const_reference first() const { return first_; }
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reference second() { return first_; }
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const_reference second() const { return first_; }
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void swap(single_object_holder& o)
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{ std::swap(first_, o.first_); }
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private:
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T first_;
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};
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template<typename T>
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struct double_object_holder {
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public:
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
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typedef Metrowerks::call_traits<T> traits_type;
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#else
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typedef boost::call_traits<T> traits_type;
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#endif
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typedef typename traits_type::param_type param_type;
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typedef typename traits_type::reference reference;
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typedef typename traits_type::const_reference const_reference;
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double_object_holder() { }
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double_object_holder(param_type t1, param_type t2)
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: first_(t1), second_(t2) { }
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reference first() { return first_; }
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const_reference first() const { return first_; }
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reference second() { return second_; }
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const_reference second() const { return second_; }
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void swap(double_object_holder& d)
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{
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std::swap(first_, d.first_);
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std::swap(second_, d.second_);
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}
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private:
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T first_, second_;
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};
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template<typename T, typename IsDouble>
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class double_object
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: public mpl::if_<
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IsDouble,
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double_object_holder<T>,
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single_object_holder<T>
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>::type
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{
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private:
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typedef typename
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mpl::if_<
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IsDouble,
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double_object_holder<T>,
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single_object_holder<T>
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>::type base_type;
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public:
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
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typedef Metrowerks::call_traits<T> traits_type;
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#else
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typedef boost::call_traits<T> traits_type;
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#endif
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typedef typename traits_type::param_type param_type;
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typedef typename traits_type::reference reference;
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typedef typename traits_type::const_reference const_reference;
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double_object() : base_type() {}
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double_object(param_type t1, param_type t2)
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: base_type(t1, t2) { }
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bool is_double() const { return IsDouble::value; }
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};
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} } } // End namespaces detail, iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED
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