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