85 lines
1.9 KiB
C++
85 lines
1.9 KiB
C++
/* Copyright 2006-2019 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (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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* See http://www.boost.org/libs/flyweight for library home page.
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*/
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#ifndef BOOST_FLYWEIGHT_DETAIL_DEFAULT_VALUE_POLICY_HPP
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#define BOOST_FLYWEIGHT_DETAIL_DEFAULT_VALUE_POLICY_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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#include <boost/detail/workaround.hpp>
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#include <boost/flyweight/detail/perfect_fwd.hpp>
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#include <boost/flyweight/detail/value_tag.hpp>
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/* Default value policy: the key is the same as the value.
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*/
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namespace boost{
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namespace flyweights{
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namespace detail{
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template<typename Value>
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struct default_value_policy:value_marker
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{
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typedef Value key_type;
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typedef Value value_type;
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struct rep_type
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{
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/* template ctors */
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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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BOOST_WORKAROUND(BOOST_GCC,<=40603)
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/* GCC bug: the default ctor generated by the variadic template ctor below
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* fails to value-initialize x.
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*/
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rep_type():x(){}
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#endif
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#define BOOST_FLYWEIGHT_PERFECT_FWD_CTR_BODY(args) \
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:x(BOOST_FLYWEIGHT_FORWARD(args)){}
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BOOST_FLYWEIGHT_PERFECT_FWD(
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explicit rep_type,
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BOOST_FLYWEIGHT_PERFECT_FWD_CTR_BODY)
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#undef BOOST_FLYWEIGHT_PERFECT_FWD_CTR_BODY
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rep_type(const rep_type& r):x(r.x){}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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rep_type(rep_type&& r):x(std::move(r.x)){}
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#endif
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operator const value_type&()const{return x;}
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value_type x;
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};
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static void construct_value(const rep_type&){}
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static void copy_value(const rep_type&){}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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static void move_value(const rep_type&){}
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#endif
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};
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} /* namespace flyweights::detail */
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} /* namespace flyweights */
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} /* namespace boost */
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#endif
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