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78e1995365
* Add std::equal_to <void> (since C++14) * Add heterogeneous std::equal (since C++14) * Add maybe_const * Add empty_base_optimization * Add is_constructible specialization for pair, tuple * Add aged associative containers: - aged_set, aged_map, aged_multiset, aged_multimap - aged_unordered_set, aged_unordered_map, - aged_unordered_multiset, aged_unordered_multimap * Fix auto keyword pass by reference * Fix basic_seconds_clock warning and project file
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Howard Hinnant <howard.hinnant@gmail.com>,
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Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_IS_CONSTRUCTIBLE_H_INCLUDED
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#define BEAST_IS_CONSTRUCTIBLE_H_INCLUDED
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#include <type_traits>
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#include <utility>
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#include <tuple>
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namespace std {
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// Ideas from Howard Hinnant
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//
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// Specializations of is_constructible for pair and tuple which
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// work around an apparent defect in the standard that causes well
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// formed expressions involving pairs or tuples of non default-constructible
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// types to generate compile errors.
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//
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template <class T, class U>
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struct is_constructible <pair <T, U>>
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: integral_constant <bool,
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is_default_constructible <T>::value &&
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is_default_constructible <U>::value>
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{
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};
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namespace detail {
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template <bool...>
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struct compile_time_all;
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template <>
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struct compile_time_all <>
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{
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static const bool value = true;
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};
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template <bool Arg0, bool ... Argn>
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struct compile_time_all <Arg0, Argn...>
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{
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static const bool value =
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Arg0 && compile_time_all <Argn...>::value;
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};
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}
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template <class ...T>
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struct is_constructible <tuple <T...>>
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: integral_constant <bool,
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detail::compile_time_all <
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is_default_constructible <T>::value...>::value>
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{
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};
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}
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#endif
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