diff options
Diffstat (limited to '3rdParty/Boost/src/boost/proto/transform/detail/lazy.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/proto/transform/detail/lazy.hpp | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/proto/transform/detail/lazy.hpp b/3rdParty/Boost/src/boost/proto/transform/detail/lazy.hpp new file mode 100644 index 0000000..fbd1365 --- /dev/null +++ b/3rdParty/Boost/src/boost/proto/transform/detail/lazy.hpp @@ -0,0 +1,79 @@ +#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> + {}; + }; + + #if N > 0 + 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 + : lazy< + typename detail::expand_pattern< + proto::arity_of<Expr>::value + , BOOST_PP_CAT(A, BOOST_PP_DEC(N)) + , detail::BOOST_PP_CAT(expand_pattern_rest_, BOOST_PP_DEC(N))< + Object + BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_DEC(N), A) + > + >::type + >::template impl<Expr, State, Data> + {}; + }; + #endif + + #undef N + +#endif |