96 lines
2.0 KiB
C++
96 lines
2.0 KiB
C++
/*
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Copyright (c) 2013 yvt
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This file is part of OpenSpades.
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OpenSpades 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, either version 3 of the License, or
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(at your option) any later version.
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OpenSpades 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 for more details.
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You should have received a copy of the GNU General Public License
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along with OpenSpades. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdio.h>
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#include <stdlib.h>
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#include "../Core/Debug.h"
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namespace spades {
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/** Deque implementation. NPOT is not fully supported. */
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template<typename T>
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class Deque {
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T *ptr;
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size_t length;
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size_t startPos;
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size_t capacity;
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public:
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Deque(size_t cap) {
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ptr = (T *)malloc(sizeof(T) * cap);
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startPos = 0;
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length = 0;
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capacity = cap;
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}
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~Deque() {
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free(ptr);
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}
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void Reserve(size_t newCap) {
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if(newCap <= capacity)
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return;
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T *newPtr = (T *)malloc(sizeof(T) * newCap);
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size_t pos = startPos;
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for(size_t i = 0; i < length; i++){
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newPtr[i] = ptr[pos++];
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if(pos == capacity)
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pos = 0;
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}
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free(ptr); ptr = newPtr;
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startPos = 0;
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capacity = newCap;
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}
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void Push(const T& e) {
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if(length + 1 > capacity){
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size_t newCap = capacity;
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while(newCap < length + 1)
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newCap <<= 1;
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Reserve(newCap);
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}
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size_t pos = startPos + length;
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if(pos >= capacity) pos -= capacity;
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ptr[pos] = e;
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length++;
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}
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T& Front() {
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return ptr[startPos];
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}
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void Shift() {
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SPAssert(length > 0);
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startPos++;
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if(startPos == capacity) startPos = 0;
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length--;
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}
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size_t GetLength() const {
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return length;
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}
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bool IsEmpty() const {
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return length == 0;
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}
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};
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}
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