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https://github.com/XRPLF/rippled.git
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34ef577604
This change replaces all include guards in the `src/` and `include/` directories by `#pragma once`.
91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
// 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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// Official repository: https://github.com/boostorg/beast
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//
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#pragma once
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#include <boost/type_traits/is_final.hpp>
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#include <type_traits>
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#include <utility>
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namespace beast {
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namespace detail {
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template <class T>
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struct is_empty_base_optimization_derived
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: std::integral_constant<bool, std::is_empty<T>::value && !boost::is_final<T>::value>
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{
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};
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template <class T, int UniqueID = 0, bool isDerived = is_empty_base_optimization_derived<T>::value>
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class empty_base_optimization : private T
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{
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public:
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empty_base_optimization() = default;
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empty_base_optimization(empty_base_optimization&&) = default;
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empty_base_optimization(empty_base_optimization const&) = default;
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empty_base_optimization&
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operator=(empty_base_optimization&&) = default;
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empty_base_optimization&
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operator=(empty_base_optimization const&) = default;
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template <class Arg1, class... ArgN>
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explicit empty_base_optimization(Arg1&& arg1, ArgN&&... argn)
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: T(std::forward<Arg1>(arg1), std::forward<ArgN>(argn)...)
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{
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}
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T&
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member() noexcept
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{
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return *this;
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}
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T const&
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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 <class T, int UniqueID>
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class empty_base_optimization<T, UniqueID, false>
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{
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T t_;
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public:
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empty_base_optimization() = default;
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empty_base_optimization(empty_base_optimization&&) = default;
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empty_base_optimization(empty_base_optimization const&) = default;
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empty_base_optimization&
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operator=(empty_base_optimization&&) = default;
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empty_base_optimization&
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operator=(empty_base_optimization const&) = default;
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template <class Arg1, class... ArgN>
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explicit empty_base_optimization(Arg1&& arg1, ArgN&&... argn)
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: t_(std::forward<Arg1>(arg1), std::forward<ArgN>(argn)...)
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{
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}
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T&
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member() noexcept
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{
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return t_;
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}
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T const&
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member() const noexcept
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{
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return t_;
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}
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};
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} // namespace detail
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} // namespace beast
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