blender/intern/cycles/util/util_vector.h

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/*
* Copyright 2011, Blender Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __UTIL_VECTOR_H__
#define __UTIL_VECTOR_H__
/* Vector */
2011-08-10 19:45:08 +00:00
#include <string.h>
#include <vector>
CCL_NAMESPACE_BEGIN
using std::vector;
/* Array
*
* Simplified version of vector, serving two purposes:
* - somewhat faster in that it does not clear memory on resize/alloc,
* this was actually showing up in profiles quite significantly
* - if this is used, we are not tempted to use inefficient operations */
template<typename T>
class array
{
public:
array()
{
data = NULL;
datasize = 0;
}
array(size_t newsize)
{
if(newsize == 0) {
data = NULL;
datasize = 0;
}
else {
data = new T[newsize];
datasize = newsize;
}
}
array(const array& from)
{
*this = from;
}
array& operator=(const array& from)
{
if(from.datasize == 0) {
data = NULL;
datasize = 0;
}
else {
data = new T[from.datasize];
memcpy(data, from.data, from.datasize*sizeof(T));
datasize = from.datasize;
}
return *this;
}
array& operator=(const vector<T>& from)
{
datasize = from.size();
data = NULL;
if(datasize > 0) {
data = new T[datasize];
memcpy(data, &from[0], datasize*sizeof(T));
}
return *this;
}
~array()
{
delete [] data;
}
void resize(size_t newsize)
{
if(newsize == 0) {
clear();
}
else {
T *newdata = new T[newsize];
memcpy(newdata, data, ((datasize < newsize)? datasize: newsize)*sizeof(T));
delete [] data;
data = newdata;
datasize = newsize;
}
}
void clear()
{
delete [] data;
data = NULL;
datasize = 0;
}
size_t size() const
{
return datasize;
}
T& operator[](size_t i) const
{
return data[i];
}
protected:
T *data;
size_t datasize;
};
CCL_NAMESPACE_END
#endif /* __UTIL_VECTOR_H__ */