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///////////////////////////////////////////////////////////////////////////////
/// \file args.hpp
/// Contains definition of \c term\<\>, \c list1\<\>, \c list2\<\>, ...
/// class templates.
//
// Copyright 2008 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_ARGS_HPP_EAN_04_01_2005
#define BOOST_PROTO_ARGS_HPP_EAN_04_01_2005
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/arithmetic/dec.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/repeat.hpp>
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
#include <boost/type_traits/is_function.hpp>
#include <boost/type_traits/is_abstract.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/or.hpp>
#include <boost/mpl/void.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto
{
namespace detail
{
// All classes derived from std::ios_base have these public nested types,
// and are non-copyable. This is an imperfect test, but it's the best we
// we can do.
template<typename T>
yes_type check_is_iostream(
typename T::failure *
, typename T::Init *
, typename T::fmtflags *
, typename T::iostate *
, typename T::openmode *
, typename T::seekdir *
);
template<typename T>
no_type check_is_iostream(...);
template<typename T>
struct is_iostream
{
static bool const value = sizeof(yes_type) == sizeof(check_is_iostream<T>(0,0,0,0,0,0));
typedef mpl::bool_<value> type;
};
/// INTERNAL ONLY
// This should be a customization point. And it serves the same purpose
// as the is_noncopyable trait in Boost.Foreach.
template<typename T>
struct ref_only
: mpl::or_<
is_function<T>
, is_abstract<T>
, is_iostream<T>
>
{};
/// INTERNAL ONLY
template<typename Expr>
struct expr_traits
{
typedef Expr value_type;
typedef Expr &reference;
typedef Expr const &const_reference;
};
/// INTERNAL ONLY
template<typename Expr>
struct expr_traits<Expr &>
{
typedef Expr value_type;
typedef Expr &reference;
typedef Expr &const_reference;
};
/// INTERNAL ONLY
template<typename Expr>
struct expr_traits<Expr const &>
{
typedef Expr value_type;
typedef Expr const &reference;
typedef Expr const &const_reference;
};
/// INTERNAL ONLY
template<typename T>
struct term_traits
{
typedef T value_type;
typedef T &reference;
typedef T const &const_reference;
};
/// INTERNAL ONLY
template<typename T>
struct term_traits<T &>
{
typedef typename mpl::if_c<ref_only<T>::value, T &, T>::type value_type;
typedef T &reference;
typedef T &const_reference;
};
/// INTERNAL ONLY
template<typename T>
struct term_traits<T const &>
{
typedef T value_type;
typedef T const &reference;
typedef T const &const_reference;
};
/// INTERNAL ONLY
template<typename T, std::size_t N>
struct term_traits<T (&)[N]>
{
typedef T value_type[N];
typedef T (&reference)[N];
typedef T (&const_reference)[N];
};
/// INTERNAL ONLY
template<typename T, std::size_t N>
struct term_traits<T const (&)[N]>
{
typedef T value_type[N];
typedef T const (&reference)[N];
typedef T const (&const_reference)[N];
};
/// INTERNAL ONLY
template<typename T, std::size_t N>
struct term_traits<T[N]>
{
typedef T value_type[N];
typedef T (&reference)[N];
typedef T const (&const_reference)[N];
};
/// INTERNAL ONLY
template<typename T, std::size_t N>
struct term_traits<T const[N]>
{
typedef T value_type[N];
typedef T const (&reference)[N];
typedef T const (&const_reference)[N];
};
}
namespace argsns_
{
// This is where term and all the different listN templates are defined
#include <boost/proto/detail/args.hpp>
}
}}
#endif
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