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// Copyright (C) 2003 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#ifndef _FIXED_SIZE_QUEUE_H_
#define _FIXED_SIZE_QUEUE_H_
// STL-look-a-like interface, but name is mixed case to distinguish it clearly from the
// real STL classes.
// Not fully featured, no safety checking yet. Add features as needed.
// TODO: "inline" storage?
template <class T, int N>
class FixedSizeQueue
{
T *storage;
int head;
int tail;
int count; // sacrifice 4 bytes for a simpler implementation. may optimize away in the future.
// Make copy constructor private for now.
FixedSizeQueue(FixedSizeQueue &other) { }
public:
FixedSizeQueue()
{
storage = new T[N];
clear();
}
~FixedSizeQueue()
{
delete [] storage;
}
void clear() {
head = 0;
tail = 0;
count = 0;
}
void push(T t) {
storage[tail] = t;
tail++;
if (tail == N)
tail = 0;
count++;
}
void pop() {
head++;
if (head == N)
head = 0;
count--;
}
T pop_front() {
const T &temp = storage[head];
pop();
return temp;
}
T &front() { return storage[head]; }
const T &front() const { return storage[head]; }
size_t size() const {
return count;
}
};
#endif // _FIXED_SIZE_QUEUE_H_
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