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83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
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// Copyright Catch2 Authors
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.txt or copy at
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// https://www.boost.org/LICENSE_1_0.txt)
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// SPDX-License-Identifier: BSL-1.0
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// Adapted from donated nonius code.
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#ifndef CATCH_CONSTRUCTOR_HPP_INCLUDED
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#define CATCH_CONSTRUCTOR_HPP_INCLUDED
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#include <catch2/internal/catch_move_and_forward.hpp>
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#include <type_traits>
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namespace Catch {
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namespace Benchmark {
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namespace Detail {
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template <typename T, bool Destruct>
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struct ObjectStorage
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{
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ObjectStorage() = default;
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ObjectStorage(const ObjectStorage& other)
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{
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new(&data) T(other.stored_object());
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}
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ObjectStorage(ObjectStorage&& other)
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{
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new(data) T(CATCH_MOVE(other.stored_object()));
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}
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~ObjectStorage() { destruct_on_exit<T>(); }
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template <typename... Args>
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void construct(Args&&... args)
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{
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new (data) T(CATCH_FORWARD(args)...);
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}
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template <bool AllowManualDestruction = !Destruct>
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std::enable_if_t<AllowManualDestruction> destruct()
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{
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stored_object().~T();
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}
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private:
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// If this is a constructor benchmark, destruct the underlying object
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template <typename U>
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void destruct_on_exit(std::enable_if_t<Destruct, U>* = nullptr) { destruct<true>(); }
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// Otherwise, don't
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template <typename U>
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void destruct_on_exit(std::enable_if_t<!Destruct, U>* = nullptr) { }
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#if defined( __GNUC__ ) && __GNUC__ <= 6
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wstrict-aliasing"
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#endif
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T& stored_object() { return *reinterpret_cast<T*>( data ); }
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T const& stored_object() const {
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return *reinterpret_cast<T const*>( data );
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}
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#if defined( __GNUC__ ) && __GNUC__ <= 6
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# pragma GCC diagnostic pop
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#endif
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alignas( T ) unsigned char data[sizeof( T )]{};
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};
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} // namespace Detail
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template <typename T>
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using storage_for = Detail::ObjectStorage<T, true>;
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template <typename T>
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using destructable_object = Detail::ObjectStorage<T, false>;
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} // namespace Benchmark
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} // namespace Catch
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#endif // CATCH_CONSTRUCTOR_HPP_INCLUDED
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