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//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//
#ifndef INCLUDED_IMF_ARRAY_H
#define INCLUDED_IMF_ARRAY_H
#include "ImfForward.h"
//-------------------------------------------------------------------------
//
// class Array
// class Array2D
//
// "Arrays of T" whose sizes are not known at compile time.
// When an array goes out of scope, its elements are automatically
// deleted.
//
// Usage example:
//
// struct C
// {
// C () {std::cout << "C::C (" << this << ")\n";};
// virtual ~C () {std::cout << "C::~C (" << this << ")\n";};
// };
//
// int
// main ()
// {
// Array <C> a(3);
//
// C &b = a[1];
// const C &c = a[1];
// C *d = a + 2;
// const C *e = a;
//
// return 0;
// }
//
//-------------------------------------------------------------------------
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
template <class T>
class IMF_EXPORT_TEMPLATE_TYPE Array
{
public:
//-----------------------------
// Constructors and destructors
//-----------------------------
Array () {_data = 0; _size = 0;}
Array (long size) {_data = new T[size]; _size = size;}
~Array () {delete [] _data;}
//-----------------------------
// Access to the array elements
//-----------------------------
operator T * () {return _data;}
operator const T * () const {return _data;}
//------------------------------------------------------
// Resize and clear the array (the contents of the array
// are not preserved across the resize operation).
//
// resizeEraseUnsafe() is more memory efficient than
// resizeErase() because it deletes the old memory block
// before allocating a new one, but if allocating the
// new block throws an exception, resizeEraseUnsafe()
// leaves the array in an unusable state.
//
//------------------------------------------------------
void resizeErase (long size);
void resizeEraseUnsafe (long size);
//-------------------------------
// Return the size of this array.
//-------------------------------
long size() const {return _size;}
private:
Array (const Array &) = delete;
Array & operator = (const Array &) = delete;
Array (Array &&) = delete;
Array & operator = (Array &&) = delete;
long _size;
T * _data;
};
template <class T>
class IMF_EXPORT_TEMPLATE_TYPE Array2D
{
public:
//-----------------------------
// Constructors and destructors
//-----------------------------
Array2D (); // empty array, 0 by 0 elements
Array2D (long sizeX, long sizeY); // sizeX by sizeY elements
~Array2D ();
//-----------------------------
// Access to the array elements
//-----------------------------
T * operator [] (long x);
const T * operator [] (long x) const;
//------------------------------------------------------
// Resize and clear the array (the contents of the array
// are not preserved across the resize operation).
//
// resizeEraseUnsafe() is more memory efficient than
// resizeErase() because it deletes the old memory block
// before allocating a new one, but if allocating the
// new block throws an exception, resizeEraseUnsafe()
// leaves the array in an unusable state.
//
//------------------------------------------------------
void resizeErase (long sizeX, long sizeY);
void resizeEraseUnsafe (long sizeX, long sizeY);
//-------------------------------
// Return the size of this array.
//-------------------------------
long height() const {return _sizeX;}
long width() const {return _sizeY;}
private:
Array2D (const Array2D &) = delete;
Array2D & operator = (const Array2D &) = delete;
Array2D (Array2D &&) = delete;
Array2D & operator = (Array2D &&) = delete;
long _sizeX;
long _sizeY;
T * _data;
};
//---------------
// Implementation
//---------------
template <class T>
inline void
Array<T>::resizeErase (long size)
{
T *tmp = new T[size];
delete [] _data;
_size = size;
_data = tmp;
}
template <class T>
inline void
Array<T>::resizeEraseUnsafe (long size)
{
delete [] _data;
_data = 0;
_size = 0;
_data = new T[size];
_size = size;
}
template <class T>
inline
Array2D<T>::Array2D ():
_sizeX(0), _sizeY (0), _data (0)
{
// emtpy
}
template <class T>
inline
Array2D<T>::Array2D (long sizeX, long sizeY):
_sizeX (sizeX), _sizeY (sizeY), _data (new T[sizeX * sizeY])
{
// emtpy
}
template <class T>
inline
Array2D<T>::~Array2D ()
{
delete [] _data;
}
template <class T>
inline T *
Array2D<T>::operator [] (long x)
{
return _data + x * _sizeY;
}
template <class T>
inline const T *
Array2D<T>::operator [] (long x) const
{
return _data + x * _sizeY;
}
template <class T>
inline void
Array2D<T>::resizeErase (long sizeX, long sizeY)
{
T *tmp = new T[sizeX * sizeY];
delete [] _data;
_sizeX = sizeX;
_sizeY = sizeY;
_data = tmp;
}
template <class T>
inline void
Array2D<T>::resizeEraseUnsafe (long sizeX, long sizeY)
{
delete [] _data;
_data = 0;
_sizeX = 0;
_sizeY = 0;
_data = new T[sizeX * sizeY];
_sizeX = sizeX;
_sizeY = sizeY;
}
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
#endif
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