188 lines
6.4 KiB
Plaintext
188 lines
6.4 KiB
Plaintext
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///////////////////////////////////////////////////////////////////////////////
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/// \file as_expr.hpp
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/// Contains definition of the as_expr\<\> and as_child\<\> helper class
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/// templates used to implement proto::domain's as_expr\<\> and as_child\<\>
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/// member templates.
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//
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// Copyright 2010 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROTO_DETAIL_AS_EXPR_HPP_EAN_06_09_2010
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#define BOOST_PROTO_DETAIL_AS_EXPR_HPP_EAN_06_09_2010
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/proto/proto_fwd.hpp>
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#include <boost/proto/args.hpp>
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#if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable : 4714) // function 'xxx' marked as __forceinline not inlined
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#endif
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namespace boost { namespace proto { namespace detail
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{
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename Generator>
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struct base_generator
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{
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typedef Generator type;
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};
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template<typename Generator>
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struct base_generator<use_basic_expr<Generator> >
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{
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typedef Generator type;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T, typename Generator, bool WantsBasicExpr>
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struct as_expr;
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T, typename Generator>
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struct as_expr<T, Generator, false>
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{
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typedef typename term_traits<T &>::value_type value_type;
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typedef proto::expr<proto::tag::terminal, term<value_type>, 0> expr_type;
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typedef typename Generator::template result<Generator(expr_type)>::type result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return Generator()(expr_type::make(t));
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T, typename Generator>
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struct as_expr<T, Generator, true>
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{
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typedef typename term_traits<T &>::value_type value_type;
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typedef proto::basic_expr<proto::tag::terminal, term<value_type>, 0> expr_type;
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typedef typename Generator::template result<Generator(expr_type)>::type result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return Generator()(expr_type::make(t));
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T>
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struct as_expr<T, proto::default_generator, false>
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{
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typedef typename term_traits<T &>::value_type value_type;
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typedef proto::expr<proto::tag::terminal, term<value_type>, 0> result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return result_type::make(t);
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T>
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struct as_expr<T, proto::default_generator, true>
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{
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typedef typename term_traits<T &>::value_type value_type;
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typedef proto::basic_expr<proto::tag::terminal, term<value_type>, 0> result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return result_type::make(t);
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T, typename Generator, bool WantsBasicExpr>
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struct as_child;
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T, typename Generator>
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struct as_child<T, Generator, false>
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
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typedef typename term_traits<T &>::reference reference;
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#else
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typedef T &reference;
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#endif
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typedef proto::expr<proto::tag::terminal, term<reference>, 0> expr_type;
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typedef typename Generator::template result<Generator(expr_type)>::type result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return Generator()(expr_type::make(t));
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T, typename Generator>
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struct as_child<T, Generator, true>
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
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typedef typename term_traits<T &>::reference reference;
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#else
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typedef T &reference;
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#endif
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typedef proto::basic_expr<proto::tag::terminal, term<reference>, 0> expr_type;
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typedef typename Generator::template result<Generator(expr_type)>::type result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return Generator()(expr_type::make(t));
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T>
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struct as_child<T, proto::default_generator, false>
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
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typedef typename term_traits<T &>::reference reference;
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#else
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typedef T &reference;
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#endif
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typedef proto::expr<proto::tag::terminal, term<reference>, 0> result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return result_type::make(t);
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename T>
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struct as_child<T, proto::default_generator, true>
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
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typedef typename term_traits<T &>::reference reference;
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#else
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typedef T &reference;
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#endif
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typedef proto::basic_expr<proto::tag::terminal, term<reference>, 0> result_type;
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BOOST_FORCEINLINE
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result_type operator()(T &t) const
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{
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return result_type::make(t);
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}
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};
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}}}
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#if defined(_MSC_VER)
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# pragma warning(pop)
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#endif
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#endif
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