Update of /cvsroot/boost/boost/boost/xpressive/proto/transform
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv28092/proto/transform
Added Files:
compose.hpp
Log Message:
transform::compose
--- NEW FILE: compose.hpp ---
///////////////////////////////////////////////////////////////////////////////
/// \file compose.hpp
/// A special-purpose proto transform for composing two transfomations. Given
/// two Grammars, expressions that match the first grammar are transformed
/// according to that grammar, and the result is forwarded to the second
/// for further transformation.
//
// Copyright 2004 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_TRANSFORM_COMPOSE_HPP_EAN_04_01_2007
#define BOOST_PROTO_TRANSFORM_COMPOSE_HPP_EAN_04_01_2007
#include <boost/xpressive/proto/detail/prefix.hpp>
#include <boost/xpressive/proto/proto_fwd.hpp>
#include <boost/xpressive/proto/detail/suffix.hpp>
namespace boost { namespace proto { namespace transform
{
// Composes two transforms
template<typename Grammar1, typename Grammar2>
struct compose
: Grammar1
{
compose();
template<typename Expr, typename State, typename Visitor>
struct apply
{
typedef typename Grammar2::template apply<
typename Grammar1::template apply<Expr, State, Visitor>::type
, State
, Visitor
>::type type;
};
template<typename Expr, typename State, typename Visitor>
static typename apply<Expr, State, Visitor>::type
call(Expr const &expr, State const &state, Visitor &visitor)
{
return Grammar2::call(Grammar1::call(expr, state, visitor), state,
visitor);
}
};
}}}
#endif
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