boost/xpressive/detail/static/transforms/as_matcher.hpp
///////////////////////////////////////////////////////////////////////////////
// as_matcher.hpp
//
// Copyright 2007 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_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MATCHER_HPP_EAN_04_01_2007
#define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MATCHER_HPP_EAN_04_01_2007
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/xpressive/detail/detail_fwd.hpp>
#include <boost/xpressive/detail/static/static.hpp>
namespace boost { namespace xpressive { namespace detail
{
template<typename Grammar>
struct as_matcher
: Grammar
{
as_matcher();
template<typename Expr, typename State, typename Visitor>
struct apply
: Visitor::template apply<
typename proto::result_of::arg<Expr>::type
>
{};
template<typename Expr, typename State, typename Visitor>
static typename apply<Expr, State, Visitor>::type
call(Expr const &expr, State const &, Visitor &visitor)
{
return visitor.call(proto::arg(expr));
}
};
}}}
#endif