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+
+// Copyright (C) 2009-2012 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0
+// (see accompanying file LICENSE_1_0.txt or a copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+// Home at http://www.boost.org/libs/functional/overloaded_function
+
+#if !BOOST_PP_IS_ITERATING
+# ifndef BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_DETAIL_BASE_HPP_
+# define BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_DETAIL_BASE_HPP_
+
+# include <boost/functional/overloaded_function/config.hpp>
+# include <boost/function.hpp>
+# include <boost/preprocessor/iteration/iterate.hpp>
+# include <boost/preprocessor/repetition/enum.hpp>
+# include <boost/preprocessor/cat.hpp>
+# include <boost/preprocessor/comma_if.hpp>
+
+#define BOOST_FUNCTIONAL_DETAIL_arg_type(z, n, unused) \
+ BOOST_PP_CAT(A, n)
+
+#define BOOST_FUNCTIONAL_DETAIL_arg_name(z, n, unused) \
+ BOOST_PP_CAT(a, n)
+
+#define BOOST_FUNCTIONAL_DETAIL_arg_tparam(z, n, unused) \
+ typename BOOST_FUNCTIONAL_DETAIL_arg_type(z, n, unused)
+
+#define BOOST_FUNCTIONAL_DETAIL_arg(z, n, unused) \
+ BOOST_FUNCTIONAL_DETAIL_arg_type(z, n, unused) \
+ BOOST_FUNCTIONAL_DETAIL_arg_name(z, n, unused)
+
+#define BOOST_FUNCTIONAL_DETAIL_f \
+ R (BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity, \
+ BOOST_FUNCTIONAL_DETAIL_arg_type, ~))
+
+// Do not use namespace ::detail because overloaded_function is already a class.
+namespace boost { namespace overloaded_function_detail {
+
+template<typename F>
+class base {}; // Empty template cannot be used directly (only its spec).
+
+# define BOOST_PP_ITERATION_PARAMS_1 \
+ (3, (0, BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX, \
+ "boost/functional/overloaded_function/detail/base.hpp"))
+# include BOOST_PP_ITERATE() // Iterate over funciton arity.
+
+} } // namespace
+
+#undef BOOST_FUNCTIONAL_DETAIL_arg_type
+#undef BOOST_FUNCTIONAL_DETAIL_arg_name
+#undef BOOST_FUNCTIONAL_DETAIL_arg_tparam
+#undef BOOST_FUNCTIONAL_DETAIL_arg
+#undef BOOST_FUNCTIONAL_DETAIL_f
+
+# endif // #include guard
+
+#elif BOOST_PP_ITERATION_DEPTH() == 1
+# define BOOST_FUNCTIONAL_DETAIL_arity BOOST_PP_FRAME_ITERATION(1)
+
+template<
+ typename R
+ BOOST_PP_COMMA_IF(BOOST_FUNCTIONAL_DETAIL_arity)
+ BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity,
+ BOOST_FUNCTIONAL_DETAIL_arg_tparam, ~)
+>
+class base< BOOST_FUNCTIONAL_DETAIL_f > {
+public:
+ /* implicit */ inline base(
+ // This requires specified type to be implicitly convertible to
+ // a boost::function<> functor.
+ boost::function< BOOST_FUNCTIONAL_DETAIL_f > const& f): f_(f)
+ {}
+
+ inline R operator()(BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity,
+ BOOST_FUNCTIONAL_DETAIL_arg, ~)) const {
+ return f_(BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity,
+ BOOST_FUNCTIONAL_DETAIL_arg_name, ~));
+ }
+
+private:
+ boost::function< BOOST_FUNCTIONAL_DETAIL_f > const f_;
+};
+
+# undef BOOST_FUNCTIONAL_DETAIL_arity
+#endif // iteration
+