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/*
* Copyright (C) 2015 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.
*/
#ifndef RINGBUFFER_H_
#define RINGBUFFER_H_
#include "utils/Macros.h"
#include <stddef.h>
namespace android {
namespace uirenderer {
template <class T, size_t SIZE>
class RingBuffer {
PREVENT_COPY_AND_ASSIGN(RingBuffer);
public:
RingBuffer() {}
~RingBuffer() {}
constexpr size_t capacity() const { return SIZE; }
size_t size() const { return mCount; }
T& next() {
mHead = (mHead + 1) % SIZE;
if (mCount < SIZE) {
mCount++;
}
return mBuffer[mHead];
}
T& front() { return (*this)[0]; }
T& back() { return (*this)[size() - 1]; }
T& operator[](size_t index) { return mBuffer[(mHead + index + 1) % mCount]; }
const T& operator[](size_t index) const { return mBuffer[(mHead + index + 1) % mCount]; }
void clear() {
mCount = 0;
mHead = -1;
}
private:
T mBuffer[SIZE];
int mHead = -1;
size_t mCount = 0;
};
} // namespace uirenderer
} // namespace android
#endif /* RINGBUFFER_H_ */
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