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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
161 lines
3.6 KiB
C++
161 lines
3.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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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_UTILITY_EMPTY_BASE_OPTIMIZATION_H_INCLUDED
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#define BEAST_UTILITY_EMPTY_BASE_OPTIMIZATION_H_INCLUDED
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#include <type_traits>
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#include <utility>
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#ifndef BEAST_NO_EMPTY_BASE_OPTIMIZATION
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# if defined _MSC_VER
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# define BEAST_NO_EMPTY_BASE_OPTIMIZATION 1
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# else
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# define BEAST_NO_EMPTY_BASE_OPTIMIZATION 1
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# endif
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#endif
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namespace beast {
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namespace detail {
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#if ! BEAST_NO_EMPTY_BASE_OPTIMIZATION
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template <class T>
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struct empty_base_optimization_decide
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: std::integral_constant <bool,
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std::is_empty <T>::value
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#ifdef __clang__
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&& !__is_final(T)
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#endif
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>
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{
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};
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#else
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template <class T>
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struct empty_base_optimization_decide
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: std::false_type
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{
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};
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#endif
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}
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//------------------------------------------------------------------------------
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template <
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class T,
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int UniqueID = 0,
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bool ShouldDeriveFrom =
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detail::empty_base_optimization_decide <T>::value
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>
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class empty_base_optimization : private T
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{
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public:
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template <
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class... Args,
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class = typename std::enable_if <
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std::is_constructible <T, Args...>::value>::type
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>
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explicit /*constexpr*/ empty_base_optimization (
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Args&&... args)
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/*noexcept (std::is_nothrow_constructible <T, Args...>::value);*/
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: T (std::forward <Args> (args)...)
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{
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}
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#if 1
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empty_base_optimization (T const& t)
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: T (t)
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{
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}
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empty_base_optimization (T&& t)
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: T (std::move (t))
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{
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}
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empty_base_optimization& operator= (
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empty_base_optimization const& other)
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{
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*this = other;
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return *this;
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}
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empty_base_optimization& operator= (
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empty_base_optimization&& other)
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{
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*this = std::move (other);
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return *this;
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}
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#endif
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T& member() noexcept
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{
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return *this;
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}
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T const& member() const noexcept
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{
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return *this;
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}
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};
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//------------------------------------------------------------------------------
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template <
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class T,
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int UniqueID
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>
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class empty_base_optimization <T, UniqueID, false>
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{
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public:
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template <
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class... Args,
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class = typename std::enable_if <
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std::is_constructible <T, Args...>::value>::type
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>
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explicit /*constexpr*/ empty_base_optimization (
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Args&&... args)
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/*noexcept (std::is_nothrow_constructible <T, Args...>::value);*/
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: m_t (std::forward <Args> (args)...)
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{
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}
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T& member() noexcept
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{
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return m_t;
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}
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T const& member() const noexcept
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{
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return m_t;
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}
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private:
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T m_t;
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};
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}
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#endif
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