66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
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/*=============================================================================
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Copyright (c) 2015 Paul Fultz II
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callable_base.h
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#ifndef BOOST_HOF_GUARD_CALLABLE_BASE_H
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#define BOOST_HOF_GUARD_CALLABLE_BASE_H
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#include <boost/hof/detail/delegate.hpp>
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#include <boost/hof/detail/result_of.hpp>
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#include <boost/hof/apply.hpp>
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#ifndef BOOST_HOF_CALLABLE_BASE_USE_TEMPLATE_ALIAS
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#if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7)
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#define BOOST_HOF_CALLABLE_BASE_USE_TEMPLATE_ALIAS 0
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#else
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#define BOOST_HOF_CALLABLE_BASE_USE_TEMPLATE_ALIAS 1
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#endif
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#endif
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namespace boost { namespace hof { namespace detail {
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template<class F>
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struct non_class_function
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{
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F f;
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BOOST_HOF_DELEGATE_CONSTRUCTOR(non_class_function, F, f)
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template<class... Ts>
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constexpr BOOST_HOF_SFINAE_RESULT(apply_f, id_<F>, id_<Ts>...)
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operator()(Ts&&... xs) const BOOST_HOF_SFINAE_RETURNS
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(
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boost::hof::apply(f, BOOST_HOF_FORWARD(Ts)(xs)...)
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);
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};
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template<class F>
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struct callable_base_type
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: std::conditional<(BOOST_HOF_IS_CLASS(F) && !BOOST_HOF_IS_FINAL(F) && !BOOST_HOF_IS_POLYMORPHIC(F)), F, non_class_function<F>>
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{};
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#if BOOST_HOF_CALLABLE_BASE_USE_TEMPLATE_ALIAS
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template<class F>
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using callable_base = typename callable_base_type<F>::type;
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#else
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template<class F>
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struct callable_base
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: callable_base_type<F>::type
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{
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typedef typename callable_base_type<F>::type base;
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BOOST_HOF_INHERIT_CONSTRUCTOR(callable_base, base)
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};
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template<class F>
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struct callable_base_type<callable_base<F>>
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: callable_base_type<F>
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{};
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#endif
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}}} // namespace boost::hof
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#endif
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