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#pragma once
#include <util/generic/vector.h>
#include <util/system/yassert.h>
template <typename T>
class TSimpleRingBuffer {
public:
TSimpleRingBuffer(size_t maxSize)
: MaxSize(maxSize)
{
Items.reserve(MaxSize);
}
TSimpleRingBuffer(const TSimpleRingBuffer&) = default;
TSimpleRingBuffer(TSimpleRingBuffer&&) = default;
TSimpleRingBuffer& operator=(const TSimpleRingBuffer&) = default;
TSimpleRingBuffer& operator=(TSimpleRingBuffer&&) = default;
// First available item
size_t FirstIndex() const {
return Begin;
}
size_t AvailSize() const {
return Items.size();
}
// Total number of items inserted
size_t TotalSize() const {
return FirstIndex() + AvailSize();
}
bool IsAvail(size_t index) const {
return index >= FirstIndex() && index < TotalSize();
}
const T& operator[](size_t index) const {
Y_ASSERT(IsAvail(index));
return Items[RealIndex(index)];
}
T& operator[](size_t index) {
Y_ASSERT(IsAvail(index));
return Items[RealIndex(index)];
}
void PushBack(const T& t) {
if (Items.size() < MaxSize) {
Items.push_back(t);
} else {
Items[RealIndex(Begin)] = t;
Begin += 1;
}
}
void Clear() {
Items.clear();
Begin = 0;
}
private:
size_t RealIndex(size_t index) const {
return index % MaxSize;
}
private:
size_t MaxSize;
size_t Begin = 0;
TVector<T> Items;
};
template <typename T, size_t maxSize>
class TStaticRingBuffer: public TSimpleRingBuffer<T> {
public:
TStaticRingBuffer()
: TSimpleRingBuffer<T>(maxSize)
{
}
};
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