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147 lines
3.8 KiB
C++
147 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef _VECTOR_H_
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#define _VECTOR_H_
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#include "Fundamentals.h"
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#define DEFAULT_START_SIZE 128
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template <class N>
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class Vector
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{
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private:
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N *start;
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N *finish;
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N *end_of_storage;
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public:
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// ----------------------------------------------------------------------------
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// constructors.
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Vector() : start(0), finish(0), end_of_storage(0) {}
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Vector(unsigned int n) : start(0), finish(0), end_of_storage(0) {reserve(n);}
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~Vector() {if (start) delete[] start;}
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// ----------------------------------------------------------------------------
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// copy.
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Vector(const Vector<N>& x) : start(0), finish(0), end_of_storage(0)
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{
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unsigned int x_size = x.size();
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const N *src = x.begin();
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if (x_size)
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{
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reserve(x_size);
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finish = start;
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while (x_size--) *finish++ = *src++;
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}
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}
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Vector<N>& operator=(const Vector<N>& x)
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{
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unsigned int x_size = x.size();
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const N *src = x.begin();
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N *dst;
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if ((&x == this) || (x_size == 0))
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return *this;
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reserve(x_size);
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finish = start;
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while (x_size--) *finish++ = *src++; // copy the elements.
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for (dst = finish; dst < end_of_storage; dst++) *dst = N();
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return *this;
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}
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// ----------------------------------------------------------------------------
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// memory management.
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void reserve(unsigned int amount)
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{
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if (!amount) amount = DEFAULT_START_SIZE;
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if (capacity() < amount)
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{
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N *tmp = new N[amount];
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N *src = begin();
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N *dst = tmp;
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unsigned int actual_size = size();
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while (actual_size--) *dst++ = *src++;
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delete[] start;
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finish = tmp + size();
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start = tmp;
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end_of_storage = start + amount;
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}
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}
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// ----------------------------------------------------------------------------
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// pointers on the elements.
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N *begin() {return start;}
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const N *begin() const {return start;}
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N *end() {return finish;}
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const N *end() const {return finish;}
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// ----------------------------------------------------------------------------
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// number of elements and the actual capacity.
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unsigned char empty() const {return (begin() == end());}
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unsigned int size() const {return (unsigned int)(end() - begin());}
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unsigned int capacity() const {return (unsigned int)(end_of_storage - begin());}
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// ----------------------------------------------------------------------------
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// add, remove, get element
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N& operator[](unsigned int index) {assert (index < size()); return start[index];}
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const N& operator[](unsigned int index) const {assert (index < size()); return start[index];}
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void fill(const N& element)
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{
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N* src = start;
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while (src < finish) *src++ = element;
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}
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void append(const N& element)
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{
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if (finish == end_of_storage)
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reserve(2 * capacity());
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*finish++ = element;
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}
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void append(unsigned int count, const N& element)
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{
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reserve(size() + count);
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while (count--) *finish++ = element;
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}
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void eraseLast() {if (!empty()) *--finish = N();}
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void eraseAll() {while (finish > start) *--finish = N();}
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N& first() {return *begin();}
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N& last() {return *(end() - 1);}
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};
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#endif /* _VECTOR_H_ */
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