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173 lines
5.6 KiB
173 lines
5.6 KiB
// boost utility/base_from_member.hpp header file --------------------------//
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// Copyright 2001, 2003, 2004, 2012 Daryle Walker. Use, modification, and
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// distribution are subject to the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or a copy at
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// <http://www.boost.org/LICENSE_1_0.txt>.)
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// See <http://www.boost.org/libs/utility/> for the library's home page.
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#ifndef BOOST_UTILITY_BASE_FROM_MEMBER_HPP
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#define BOOST_UTILITY_BASE_FROM_MEMBER_HPP
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#include <boost/config.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/utility/enable_if.hpp>
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// Base-from-member arity configuration macro ------------------------------//
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// The following macro determines how many arguments will be in the largest
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// constructor template of base_from_member. Constructor templates will be
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// generated from one argument to this maximum. Code from other files can read
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// this number if they need to always match the exact maximum base_from_member
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// uses. The maximum constructor length can be changed by overriding the
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// #defined constant. Make sure to apply the override, if any, for all source
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// files during project compiling for consistency.
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// Contributed by Jonathan Turkanis
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#ifndef BOOST_BASE_FROM_MEMBER_MAX_ARITY
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#define BOOST_BASE_FROM_MEMBER_MAX_ARITY 10
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#endif
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// An iteration of a constructor template for base_from_member -------------//
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// A macro that should expand to:
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// template < typename T1, ..., typename Tn >
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// base_from_member( T1 x1, ..., Tn xn )
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// : member( x1, ..., xn )
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// {}
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// This macro should only persist within this file.
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#define BOOST_PRIVATE_CTR_DEF( z, n, data ) \
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template < BOOST_PP_ENUM_PARAMS(n, typename T) > \
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base_from_member( BOOST_PP_ENUM_BINARY_PARAMS(n, T, x) ) \
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: member( BOOST_PP_ENUM_PARAMS(n, x) ) \
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{} \
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/**/
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namespace boost
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{
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namespace detail
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{
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// Type-unmarking class template -------------------------------------------//
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// Type-trait to get the raw type, i.e. the type without top-level reference nor
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// cv-qualification, from a type expression. Mainly for function arguments, any
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// reference part is stripped first.
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// Contributed by Daryle Walker
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template < typename T >
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struct remove_cv_ref
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{
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typedef typename ::boost::remove_cv<typename
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::boost::remove_reference<T>::type>::type type;
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}; // boost::detail::remove_cv_ref
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// Unmarked-type comparison class template ---------------------------------//
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// Type-trait to check if two type expressions have the same raw type.
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// Contributed by Daryle Walker, based on a work-around by Luc Danton
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template < typename T, typename U >
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struct is_related
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: public ::boost::is_same<
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typename ::boost::detail::remove_cv_ref<T>::type,
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typename ::boost::detail::remove_cv_ref<U>::type >
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{};
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// Enable-if-on-unidentical-unmarked-type class template -------------------//
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// Enable-if on the first two type expressions NOT having the same raw type.
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// Contributed by Daryle Walker, based on a work-around by Luc Danton
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#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
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template<typename ...T>
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struct enable_if_unrelated
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: public ::boost::enable_if_c<true>
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{};
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template<typename T, typename U, typename ...U2>
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struct enable_if_unrelated<T, U, U2...>
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: public ::boost::disable_if< ::boost::detail::is_related<T, U> >
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{};
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#endif
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} // namespace boost::detail
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// Base-from-member class template -----------------------------------------//
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// Helper to initialize a base object so a derived class can use this
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// object in the initialization of another base class. Used by
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// Dietmar Kuehl from ideas by Ron Klatcho to solve the problem of a
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// base class needing to be initialized by a member.
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// Contributed by Daryle Walker
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template < typename MemberType, int UniqueID = 0 >
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class base_from_member
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{
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protected:
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MemberType member;
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
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!defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \
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!defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && \
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!(defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 4))
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template <typename ...T, typename EnableIf = typename
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::boost::detail::enable_if_unrelated<base_from_member, T...>::type>
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explicit BOOST_CONSTEXPR base_from_member( T&& ...x )
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BOOST_NOEXCEPT_IF( BOOST_NOEXCEPT_EXPR(::new ((void*) 0) MemberType(
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static_cast<T&&>(x)... )) ) // no std::is_nothrow_constructible...
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: member( static_cast<T&&>(x)... ) // ...nor std::forward needed
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{}
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#else
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base_from_member()
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: member()
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{}
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template < typename T0 > explicit base_from_member( T0 x0 ) : member( x0 ) {}
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BOOST_PP_REPEAT_FROM_TO( 2, BOOST_PP_INC(BOOST_BASE_FROM_MEMBER_MAX_ARITY),
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BOOST_PRIVATE_CTR_DEF, _ )
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#endif
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}; // boost::base_from_member
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template < typename MemberType, int UniqueID >
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class base_from_member<MemberType&, UniqueID>
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{
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protected:
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MemberType& member;
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explicit BOOST_CONSTEXPR base_from_member( MemberType& x )
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BOOST_NOEXCEPT
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: member( x )
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{}
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}; // boost::base_from_member
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} // namespace boost
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// Undo any private macros
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#undef BOOST_PRIVATE_CTR_DEF
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#endif // BOOST_UTILITY_BASE_FROM_MEMBER_HPP
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