77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
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// Copyright (c) 2016 Klemens D. Morgenstern
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//
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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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#ifndef BOOST_PROCESS_DETAIL_TRAITS_DECL_HPP_
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#define BOOST_PROCESS_DETAIL_TRAITS_DECL_HPP_
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#include <boost/process/detail/config.hpp>
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#include <boost/none.hpp>
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#include <type_traits>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/detail/posix/handler.hpp>
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#elif defined(BOOST_WINDOWS_API)
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#include <boost/process/detail/windows/handler.hpp>
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#endif
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namespace boost { namespace process { namespace detail {
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template<typename T>
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struct is_initializer : std::is_base_of<handler_base, T> {};
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template<typename T>
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struct is_initializer<T&> : std::is_base_of<handler_base, T> {};
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template<typename T>
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struct initializer_tag;// { typedef void type; };
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//remove const
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template<typename T>
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struct initializer_tag<const T> { typedef typename initializer_tag<T>::type type; };
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//remove &
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template<typename T>
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struct initializer_tag<T&> { typedef typename initializer_tag<T>::type type; };
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//remove const &
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template<typename T>
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struct initializer_tag<const T&> { typedef typename initializer_tag<T>::type type; };
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template<typename T>
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struct initializer_builder;
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template<typename First, typename ...Args>
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struct valid_argument_list;
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template<typename First>
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struct valid_argument_list<First>
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{
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constexpr static bool value = is_initializer<First>::value || !std::is_void<typename initializer_tag<First>::type>::value;
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typedef std::integral_constant<bool, value> type;
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};
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template<typename First, typename ...Args>
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struct valid_argument_list
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{
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constexpr static bool my_value = is_initializer<First>::value || !std::is_void<typename initializer_tag<First>::type>::value;
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constexpr static bool value = valid_argument_list<Args...>::value && my_value;
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typedef std::integral_constant<bool, value> type;
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};
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}}}
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#endif /* BOOST_PROCESS_DETAIL_HANDLER_HPP_ */
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