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