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91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
/****************************************************************************
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Copyright (c) 2020-2022 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated engine source code (the "Software"), a limited,
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worldwide, royalty-free, non-assignable, revocable and non-exclusive license
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to use Cocos Creator solely to develop games on your target platforms. You shall
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not use Cocos Creator software for developing other software or tools that's
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used for developing games. You are not granted to publish, distribute,
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sublicense, and/or sell copies of Cocos Creator.
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The software or tools in this License Agreement are licensed, not sold.
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Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#pragma once
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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namespace cc {
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template <typename Index, typename Enable = std::enable_if_t<std::is_integral<Index>::value>>
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class IndexHandle {
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public:
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struct Hasher {
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inline std::size_t operator()(IndexHandle const &s) const noexcept { return s._index; }
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};
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using IndexType = Index;
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IndexHandle() noexcept = default;
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explicit IndexHandle(IndexType index) noexcept : _index(index) {}
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inline bool isValid() const noexcept;
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inline void clear() noexcept;
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inline bool operator<(IndexHandle const &rhs) const noexcept;
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inline bool operator==(IndexHandle const &rhs) const noexcept;
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inline bool operator!=(IndexHandle const &rhs) const noexcept;
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inline operator IndexType() const noexcept; // NOLINT(google-explicit-constructor) we need this implicitly
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static IndexType constexpr UNINITIALIZED{std::numeric_limits<IndexType>::max()};
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private:
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IndexType _index{UNINITIALIZED};
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};
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template <typename Index, typename Enable>
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bool IndexHandle<Index, Enable>::isValid() const noexcept {
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return _index != UNINITIALIZED;
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}
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template <typename Index, typename Enable>
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void IndexHandle<Index, Enable>::clear() noexcept {
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_index = UNINITIALIZED;
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}
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template <typename Index, typename Enable>
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bool IndexHandle<Index, Enable>::operator<(IndexHandle const &rhs) const noexcept {
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return _index < rhs._index;
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}
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template <typename Index, typename Enable>
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bool IndexHandle<Index, Enable>::operator==(IndexHandle const &rhs) const noexcept {
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return (_index == rhs._index);
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}
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template <typename Index, typename Enable>
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bool IndexHandle<Index, Enable>::operator!=(IndexHandle const &rhs) const noexcept {
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return !operator==(rhs);
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}
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template <typename Index, typename Enable>
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IndexHandle<Index, Enable>::operator IndexType() const noexcept {
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return _index;
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}
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} // namespace cc
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