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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <array>
/* Helper class generating N unique ids, from 0 to N-1 */
template <std::size_t N>
class IdGenerator {
public:
static int ALL_USED;
IdGenerator() : in_use_{} {}
/* Returns next free id, or ALL_USED if no ids left */
int GetNext() {
for (std::size_t i = 0; i < N; i++) {
if (!in_use_[i]) {
in_use_[i] = true;
return i;
}
}
return ALL_USED;
}
/* Release given ID */
void Release(int id) { in_use_[id] = false; }
private:
std::array<bool, N> in_use_;
};
template <std::size_t N>
int IdGenerator<N>::ALL_USED = -1;
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