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b08653d69d
std::optional makes a few things a bit neater and less error prone. However, we still cannot use C++17 (unfortunately), so this commit adds an implementation of std::optional that we can use right now. Based on https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/lib/gtl/optional.h which seems to be fairly similar to C++17's <optional> and standards compliant. It's one of the few implementations that handle propagating type traits like copy constructibility, just like libc++/libstdc++.
44 lines
810 B
C++
44 lines
810 B
C++
// Copyright 2017 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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// MPark.Variant
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//
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// Copyright Michael Park, 2015-2017
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <cstddef>
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namespace std
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{
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struct in_place_t
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{
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explicit in_place_t() = default;
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};
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template <std::size_t I>
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struct in_place_index_t
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{
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explicit in_place_index_t() = default;
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};
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template <typename T>
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struct in_place_type_t
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{
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explicit in_place_type_t() = default;
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};
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constexpr in_place_t in_place{};
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template <std::size_t I>
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constexpr in_place_index_t<I> in_place_index{};
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template <typename T>
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constexpr in_place_type_t<T> in_place_type{};
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} // namespace std
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