Chris@16: #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
Chris@16: 
Chris@16:     #include <boost/proto/transform/detail/preprocessed/lazy.hpp>
Chris@16: 
Chris@16: #elif !defined(BOOST_PP_IS_ITERATING)
Chris@16: 
Chris@16:     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
Chris@16:         #pragma wave option(preserve: 2, line: 0, output: "preprocessed/lazy.hpp")
Chris@16:     #endif
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////////
Chris@16:     /// \file lazy.hpp
Chris@16:     /// Contains definition of the lazy<> transform.
Chris@16:     //
Chris@16:     //  Copyright 2008 Eric Niebler. Distributed under the Boost
Chris@16:     //  Software License, Version 1.0. (See accompanying file
Chris@16:     //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16:     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
Chris@16:         #pragma wave option(preserve: 1)
Chris@16:     #endif
Chris@16: 
Chris@16:     #define BOOST_PP_ITERATION_PARAMS_1                                                             \
Chris@16:         (3, (0, BOOST_PROTO_MAX_ARITY, <boost/proto/transform/detail/lazy.hpp>))
Chris@16:     #include BOOST_PP_ITERATE()
Chris@16: 
Chris@16:     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
Chris@16:         #pragma wave option(output: null)
Chris@16:     #endif
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:     #define N BOOST_PP_ITERATION()
Chris@16: 
Chris@16:     /// \brief A PrimitiveTransform that uses <tt>make\<\></tt> to build
Chris@16:     /// a CallableTransform, and then uses <tt>call\<\></tt> to apply it.
Chris@16:     ///
Chris@16:     /// <tt>lazy\<\></tt> is useful as a higher-order transform, when the
Chris@16:     /// transform to be applied depends on the current state of the
Chris@16:     /// transformation. The invocation of the <tt>make\<\></tt> transform
Chris@16:     /// evaluates any nested transforms, and the resulting type is treated
Chris@16:     /// as a CallableTransform, which is evaluated with <tt>call\<\></tt>.
Chris@16:     template<typename Object BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
Chris@16:     struct lazy<Object(BOOST_PP_ENUM_PARAMS(N, A))>
Chris@16:       : transform<lazy<Object(BOOST_PP_ENUM_PARAMS(N, A))> >
Chris@16:     {
Chris@16:         template<typename Expr, typename State, typename Data>
Chris@16:         struct impl
Chris@16:           : call<
Chris@16:                 typename make<Object>::template impl<Expr, State, Data>::result_type
Chris@16:                 (BOOST_PP_ENUM_PARAMS(N, A))
Chris@16:             >::template impl<Expr, State, Data>
Chris@16:         {};
Chris@16:     };
Chris@16: 
Chris@16:     #if N > 0
Chris@16:     template<typename Object BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
Chris@16:     struct lazy<Object(BOOST_PP_ENUM_PARAMS(N, A)...)>
Chris@16:       : transform<lazy<Object(BOOST_PP_ENUM_PARAMS(N, A)...)> >
Chris@16:     {
Chris@16:         template<typename Expr, typename State, typename Data>
Chris@16:         struct impl
Chris@16:           : lazy<
Chris@16:                 typename detail::expand_pattern<
Chris@16:                     proto::arity_of<Expr>::value
Chris@16:                   , BOOST_PP_CAT(A, BOOST_PP_DEC(N))
Chris@16:                   , detail::BOOST_PP_CAT(expand_pattern_rest_, BOOST_PP_DEC(N))<
Chris@16:                         Object
Chris@16:                         BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_DEC(N), A)
Chris@16:                     >
Chris@16:                 >::type
Chris@16:             >::template impl<Expr, State, Data>
Chris@16:         {};
Chris@16:     };
Chris@16:     #endif
Chris@16: 
Chris@16:     #undef N
Chris@16: 
Chris@16: #endif