// Copyright (c) 2001-2011 Hartmut Kaiser | |
// | |
// 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) | |
#if !defined(BOOST_SPIRIT_KARMA_AS_STRING_DEC_18_0644PM) | |
#define BOOST_SPIRIT_KARMA_AS_STRING_DEC_18_0644PM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/spirit/home/support/unused.hpp> | |
#include <boost/spirit/home/support/attributes_fwd.hpp> | |
/////////////////////////////////////////////////////////////////////////////// | |
namespace boost { namespace spirit { namespace traits | |
{ | |
/////////////////////////////////////////////////////////////////////////// | |
// This file contains the attribute to string conversion utility. The | |
// utility provided also accept spirit's unused_type; all no-ops. Compiler | |
// optimization will easily strip these away. | |
/////////////////////////////////////////////////////////////////////////// | |
/////////////////////////////////////////////////////////////////////////// | |
template <typename T, typename Attribute> | |
inline typename spirit::result_of::attribute_as<T, Attribute>::type | |
as(Attribute const& attr) | |
{ | |
return attribute_as<T, Attribute>::call(attr); | |
} | |
template <typename T> | |
inline unused_type as(unused_type) | |
{ | |
return unused; | |
} | |
/////////////////////////////////////////////////////////////////////////// | |
template <typename T, typename Attribute> | |
inline bool valid_as(Attribute const& attr) | |
{ | |
return attribute_as<T, Attribute>::is_valid(attr); | |
} | |
template <typename T> | |
inline bool valid_as(unused_type) | |
{ | |
return true; | |
} | |
}}} | |
/////////////////////////////////////////////////////////////////////////////// | |
namespace boost { namespace spirit { namespace result_of | |
{ | |
template <typename T, typename Attribute> | |
struct attribute_as | |
: traits::attribute_as<T, Attribute> | |
{}; | |
template <typename T> | |
struct attribute_as<T, unused_type> | |
{ | |
typedef unused_type type; | |
}; | |
template <typename T> | |
struct attribute_as<T, unused_type const> | |
{ | |
typedef unused_type type; | |
}; | |
}}} | |
#endif |