You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
58 lines
2.2 KiB
58 lines
2.2 KiB
#if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES) |
|
|
|
#include <boost/proto/transform/detail/preprocessed/lazy.hpp> |
|
|
|
#elif !defined(BOOST_PP_IS_ITERATING) |
|
|
|
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) |
|
#pragma wave option(preserve: 2, line: 0, output: "preprocessed/lazy.hpp") |
|
#endif |
|
|
|
/////////////////////////////////////////////////////////////////////////////// |
|
/// \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) |
|
|
|
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) |
|
#pragma wave option(preserve: 1) |
|
#endif |
|
|
|
#define BOOST_PP_ITERATION_PARAMS_1 \ |
|
(3, (0, BOOST_PROTO_MAX_ARITY, <boost/proto/transform/detail/lazy.hpp>)) |
|
#include BOOST_PP_ITERATE() |
|
|
|
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) |
|
#pragma wave option(output: null) |
|
#endif |
|
|
|
#else |
|
|
|
#define N BOOST_PP_ITERATION() |
|
|
|
/// \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 BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)> |
|
struct lazy<Object(BOOST_PP_ENUM_PARAMS(N, A))> |
|
: transform<lazy<Object(BOOST_PP_ENUM_PARAMS(N, A))> > |
|
{ |
|
template<typename Expr, typename State, typename Data> |
|
struct impl |
|
: call< |
|
typename make<Object>::template impl<Expr, State, Data>::result_type |
|
(BOOST_PP_ENUM_PARAMS(N, A)) |
|
>::template impl<Expr, State, Data> |
|
{}; |
|
}; |
|
|
|
#undef N |
|
|
|
#endif
|
|
|