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/*
* Copyright (c) 2009 Samit Basu
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __Vector_hpp__
#define __Vector_hpp__
#include <QSharedData>
#include <new>
#include "Exception.hpp"
inline size_t compute_initial_capacity(size_t len)
{
return len*2;
}
template <typename T>
inline void initialize_memory(T* ptr, size_t len)
{
if (sizeof(T) <= 8)
memset(ptr,0,sizeof(T)*len);
}
template <typename T>
inline void copy_memory(T* dest, const T* src, size_t count)
{
if (sizeof(T) <= 8)
memcpy(dest,src,count*sizeof(T));
else
for (int i=0;i<count;i++)
dest[i] = src[i];
}
template <typename T>
class VectorData : public QSharedData
{
T* m_data;
size_t m_len;
size_t m_capacity;
void allocate(size_t len) {
try {
m_data = new T[len];
initialize_memory(m_data,len);
} catch (const std::bad_alloc& ) {
throw Exception(QString("Cannot allocate enough memory to store an array of size %1").arg(m_len));
}
}
void copyvec(const VectorData& copy) {
if (m_data) delete[] m_data;
m_len = copy.m_len;
m_capacity = copy.m_capacity;
if (m_len) {
allocate(m_capacity);
copy_memory<T>(m_data,copy.m_data,m_len);
}
}
public:
inline VectorData() : m_data(0), m_len(0), m_capacity(0) {}
inline VectorData(size_t dim) {
try {
m_len = dim;
m_capacity = compute_initial_capacity(m_len);
allocate(m_capacity);
} catch (const std::bad_alloc& ) {
throw Exception(QString("Cannot allocate enough memory to store an array of size %1").arg(dim));
}
}
inline VectorData(const VectorData& copy) : QSharedData(copy), m_data(0), m_len(0), m_capacity(0) {
copyvec(copy);
}
inline ~VectorData() {
if (m_data) delete[] m_data;
}
inline void resize(size_t new_len) {
if (new_len <= m_capacity)
m_len = new_len;
else
{
try {
size_t new_capacity = compute_initial_capacity(new_len);
T* new_data = new T[new_capacity];
initialize_memory(new_data,new_capacity);
copy_memory(new_data,m_data,m_len);
delete[] m_data;
m_len = new_len;
m_capacity = new_capacity;
m_data = new_data;
} catch (const std::bad_alloc&) {
throw Exception(QString("Cannot allocate enough memory to resize array to size %1").arg(new_len));
}
}
}
inline T operator[](size_t p) const {
return m_data[p];
}
inline T& operator[](size_t p) {
return m_data[p];
}
inline T at(size_t p) const {
return m_data[p];
}
inline T* data() {
return m_data;
}
inline const T* data() const {
return m_data;
}
inline void clear() {
m_len = 0;
if (m_data)
delete[] m_data;
m_data = 0;
}
};
template <typename T>
class Vector
{
public:
inline Vector() {d = new VectorData<T>();}
inline Vector(size_t dim) {d = new VectorData<T>(dim);}
inline Vector(const Vector& copy) : d(copy.d) {}
inline T operator[](size_t p) const {
return (*d)[p];
}
inline T& operator[](size_t p) {
return (*d)[p];
}
inline T at(size_t p) const {
return d->at[p];
}
inline T* data() {
return d->data();
}
inline const T* data() const {
return d->data();
}
inline void clear() {
d->clear();
}
inline void resize(size_t newlen) {
d->resize(newlen);
}
private:
QSharedDataPointer<VectorData<T> > d;
};
#endif
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