57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
// =====================================================================================================================
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// Copyright 2024 Medusa Slockbower
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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 ENGINE_UNIQUEID_H
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#define ENGINE_UNIQUEID_H
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#include <cstdint>
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namespace open_cpp_utils
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{
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// Internal function for incrementing an id associated with a type
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template<typename Base> uint64_t _increment_id()
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{
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static uint64_t current = 0;
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return current++;
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}
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/**
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* \brief Generate a unique id for a type given a base type
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* \tparam Base Base type for id categorization
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* \tparam Type Type for id generation
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* \return Generated ID for Type and Base combination
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*
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* Example:
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*
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* unique_id<void, int>() = 0
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* unique_id<void, unsigned int>() = 1
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*
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* unique_id<int, int>() = 0
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*/
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template<typename Base, typename Type> uint64_t unique_id()
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{
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static bool initialized = false;
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static uint64_t id = 0;
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if(initialized) return id;
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initialized = true;
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return id = _increment_id<Base>();
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}
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}
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#endif //ENGINE_UNIQUEID_H
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