90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef TNT_FILAMENT_UTILS_ENTITYINSTANCE_H
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#define TNT_FILAMENT_UTILS_ENTITYINSTANCE_H
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#include <utils/compiler.h>
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#include <type_traits>
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#include <stdint.h>
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namespace utils {
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class UTILS_PUBLIC EntityInstanceBase {
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public:
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using Type = uint32_t;
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protected:
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Type mInstance = 0;
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};
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template <typename T, bool EDIT = false>
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class UTILS_PUBLIC EntityInstance : public EntityInstanceBase {
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public:
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// default Instance is invalid
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constexpr EntityInstance() noexcept = default;
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// check if this Instance is valid
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constexpr bool isValid() const noexcept { return mInstance != 0; }
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// Instances of same type can be copied/assigned
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constexpr EntityInstance(EntityInstance const& other) noexcept = default;
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constexpr EntityInstance& operator=(EntityInstance const& other) noexcept = default;
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// EDIT instances can be converted to "read" Instances of same type
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template <typename = std::enable_if<!EDIT>>
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constexpr explicit EntityInstance(EntityInstance<T, true> const& other) noexcept {
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mInstance = other.asValue();
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}
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template <typename = std::enable_if<!EDIT>>
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EntityInstance& operator=(EntityInstance<T, true> const& other) noexcept {
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mInstance = other.asValue();
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return *this;
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}
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// Instances can be compared
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constexpr bool operator!=(EntityInstance e) const { return mInstance != e.mInstance; }
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constexpr bool operator==(EntityInstance e) const { return mInstance == e.mInstance; }
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// Instances can be sorted
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constexpr bool operator<(EntityInstance e) const { return mInstance < e.mInstance; }
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constexpr bool operator<=(EntityInstance e) const { return mInstance <= e.mInstance; }
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constexpr bool operator>(EntityInstance e) const { return mInstance > e.mInstance; }
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constexpr bool operator>=(EntityInstance e) const { return mInstance >= e.mInstance; }
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// and we can iterate
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constexpr EntityInstance& operator++() noexcept { ++mInstance; return *this; }
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constexpr EntityInstance& operator--() noexcept { --mInstance; return *this; }
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constexpr const EntityInstance operator++(int) const noexcept { return EntityInstance{ mInstance + 1 }; }
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constexpr const EntityInstance operator--(int) const noexcept { return EntityInstance{ mInstance - 1 }; }
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// return a value for this Instance (mostly needed for debugging
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constexpr uint32_t asValue() const noexcept { return mInstance; }
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// auto convert to Type so it can be used as an index
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constexpr operator Type() const noexcept { return mInstance; } // NOLINT(google-explicit-constructor)
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// conversion from Type so we can initialize from an index
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constexpr EntityInstance(Type value) noexcept { mInstance = value; } // NOLINT(google-explicit-constructor)
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};
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} // namespace utils
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#endif // TNT_FILAMENT_UTILS_ENTITYINSTANCE_H
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