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///////////////////////////////////////////////////////////////////////////////
/// \file lazy.hpp
/// Contains definition of the lazy<> transform.
//
// 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_TRANSFORM_LAZY_HPP_EAN_12_02_2007
#define BOOST_PROTO_TRANSFORM_LAZY_HPP_EAN_12_02_2007
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
#include <boost/proto/proto_fwd.hpp>
#include <boost/proto/transform/make.hpp>
#include <boost/proto/transform/call.hpp>
#include <boost/proto/transform/impl.hpp>
#include <boost/proto/transform/detail/pack.hpp>
namespace boost { namespace proto
{
/// \brief A PrimitiveTransform that uses <tt>make\<\></tt> to build
/// a CallableTransform, and then uses <tt>call\<\></tt> to apply it.
///
/// <tt>lazy\<\></tt> is useful as a higher-order transform, when the
/// transform to be applied depends on the current state of the
/// transformation. The invocation of the <tt>make\<\></tt> transform
/// evaluates any nested transforms, and the resulting type is treated
/// as a CallableTransform, which is evaluated with <tt>call\<\></tt>.
template<typename Object>
struct lazy : transform<lazy<Object> >
{
template<typename Expr, typename State, typename Data>
struct impl
: call<
typename make<Object>::template impl<Expr, State, Data>::result_type
>::template impl<Expr, State, Data>
{};
};
/// INTERNAL ONLY
template<typename Fun>
struct lazy<detail::msvc_fun_workaround<Fun> >
: lazy<Fun>
{};
#include <boost/proto/transform/detail/lazy.hpp>
/// INTERNAL ONLY
///
template<typename Object>
struct is_callable<lazy<Object> >
: mpl::true_
{};
}}
#endif
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