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-rw-r--r--boost/proto/transform/detail/expand_pack.hpp46
1 files changed, 46 insertions, 0 deletions
diff --git a/boost/proto/transform/detail/expand_pack.hpp b/boost/proto/transform/detail/expand_pack.hpp
new file mode 100644
index 0000000000..c87e3807c4
--- /dev/null
+++ b/boost/proto/transform/detail/expand_pack.hpp
@@ -0,0 +1,46 @@
+#if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
+
+ #include <boost/proto/transform/detail/preprocessed/expand_pack.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/expand_pack.hpp")
+ #endif
+
+ ///////////////////////////////////////////////////////////////////////////////
+ /// \file expand_pack.hpp
+ /// Contains helpers for pseudo-pack expansion.
+ //
+ // Copyright 2012 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/expand_pack.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()
+ #define M0(Z, X, DATA) typename expand_pattern_helper<Tfx, BOOST_PP_CAT(A, X)>::type
+ #define M1(Z, X, DATA) expand_pattern_helper<Tfx, BOOST_PP_CAT(A, X)>::applied::value ||
+
+ template<typename Tfx, typename Ret BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
+ struct expand_pattern_helper<Tfx, Ret(BOOST_PP_ENUM_PARAMS(N, A))>
+ {
+ typedef Ret (*type)(BOOST_PP_ENUM(N, M0, ~));
+ typedef mpl::bool_<BOOST_PP_REPEAT(N, M1, ~) false> applied;
+ };
+
+ #undef M1
+ #undef M0
+ #undef N
+#endif