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