//
// Array2D.h 2005-11-27 5:50 AM
//
#define UINT unsigned int
//
//
//
class ArrayType2D {
private:
int Width;
int Height;
int Size;
UINT* Array;
bool Allocated;
void Copy(ArrayType2 D& Array2);
public:
ArrayType2D();
ArrayType2D(Arr ayType2D& Array2) { Copy(Array2); };
~ArrayType2D() { if (Allocated) delete [] Array; };
UINT& operator()(cons t UINT ROW, const UINT COL) { return Array[ROW * Width + COL]; }
ArrayType2D& operator=(Array Type2D& Array2) { Copy(Array2); return *this; };
UINT* operator&() { return Array; };
const int width() { return Width; };
const int height() { return Height; };
void Allocate(int Height, int Width);
};
void ArrayType2D::Co py(ArrayType2D& Array2) {
if (this->Allocated)
delete [] Array;
this->Width = Array2.Width;
this->Height = Array2.Height;
this->Size = Array2.Size;
this->Array = new UINT [Size];
for (int N = 0; N < Size; N++)
Array[N] = Array2.Array[N];
this->Allocated = true;
}
ArrayType2D::Ar rayType2D() {
Width = 0;
Height = 0;
Size = 0;
Array = NULL;
Allocated = false;
}
inline void ArrayType2D::Al locate(int Height, int Width) {
if (Allocated)
delete [] Array;
this->Width = Width;
this->Height = Height;
this->Size = Width * Height;
this->Array = new UINT [Size];
this->Allocated = true;
} 9 2073
//
// Array2D.h 2005-11-27 5:50 AM
//
#define UINT unsigned int
//
//
//
class ArrayType2D {
private:
int Width;
int Height;
int Size;
UINT* Array;
bool Allocated;
void Copy(ArrayType2 D& Array2);
public:
ArrayType2D();
ArrayType2D(Arr ayType2D& Array2) { Copy(Array2); };
~ArrayType2D() { if (Allocated) delete [] Array; };
UINT& operator()(cons t UINT ROW, const UINT COL) { return Array[ROW * Width + COL]; }
ArrayType2D& operator=(Array Type2D& Array2) { Copy(Array2); return *this; };
UINT* operator&() { return Array; };
const int width() { return Width; };
const int height() { return Height; };
void Allocate(int Height, int Width);
};
void ArrayType2D::Co py(ArrayType2D& Array2) {
if (this->Allocated)
delete [] Array;
this->Width = Array2.Width;
this->Height = Array2.Height;
this->Size = Array2.Size;
this->Array = new UINT [Size];
for (int N = 0; N < Size; N++)
Array[N] = Array2.Array[N];
this->Allocated = true;
}
ArrayType2D::Ar rayType2D() {
Width = 0;
Height = 0;
Size = 0;
Array = NULL;
Allocated = false;
}
inline void ArrayType2D::Al locate(int Height, int Width) {
if (Allocated)
delete [] Array;
this->Width = Width;
this->Height = Height;
this->Size = Width * Height;
this->Array = new UINT [Size];
this->Allocated = true;
}
//
// Array2D.h 2005-11-27 5:50 AM
//
#define UINT unsigned int
class ArrayType2D {
private:
int Width;
int Height;
int Size;
UINT* Array;
bool Allocated;
void Copy(ArrayType2 D& Array2);
public:
ArrayType2D();
ArrayType2D(Arr ayType2D& Array2) { Copy(Array2); };
~ArrayType2D() { if (Allocated) delete [] Array; };
UINT& operator()(cons t UINT ROW, const UINT COL) { return Array[ROW * Width + COL]; }
ArrayType2D& operator=(Array Type2D& Array2) { Copy(Array2); return *this; };
UINT* operator&() { return Array; };
const int width() { return Width; };
const int height() { return Height; };
void Allocate(int Height, int Width);
};
void ArrayType2D::Co py(ArrayType2D& Array2) {
if (this->Allocated)
delete [] Array;
this->Width = Array2.Width;
this->Height = Array2.Height;
this->Size = Array2.Size;
this->Array = new UINT [Size];
for (int N = 0; N < Size; N++)
Array[N] = Array2.Array[N];
this->Allocated = true;
}
ArrayType2D::Ar rayType2D() {
Width = 0;
Height = 0;
Size = 0;
Array = NULL;
Allocated = false;
}
inline void ArrayType2D::Al locate(int Height, int Width) {
if (Allocated)
delete [] Array;
this->Width = Width;
this->Height = Height;
this->Size = Width * Height;
this->Array = new UINT [Size];
this->Allocated = true;
}
Peter Olcott wrote: // // Array2D.h 2005-11-27 5:50 AM //
I actually couldn't get what is "fast" and what is "dynamic" with this
Array class. Its not even polymorphic.
You could get much more with, say vectors.
Or am I missing something out here?
"Neelesh Bodas" <ne***********@ gmail.com> wrote in message news:11******** *************@g 47g2000cwa.goog legroups.com... Peter Olcott wrote: // // Array2D.h 2005-11-27 5:50 AM //
I actually couldn't get what is "fast" and what is "dynamic" with this Array class. Its not even polymorphic. You could get much more with, say vectors.
Or am I missing something out here?
I have not yet transformed it into the syntax of templates, so it only
does unsigned integers at the moment. I will make this conversion
some time soon. The memory allocated to this array is dynamically
allocated at run-time as opposed to statically allocated at compile-time.
Every other dynamically allocated array is either restricted to single
dimensional access, or allocates each row separately, making it much
slower. When I benchmarked this latter design it was fifty-fold slower
than my design.
Peter Olcott wrote: "Neelesh Bodas" <ne***********@ gmail.com> wrote in message news:11******** *************@g 47g2000cwa.goog legroups.com...
Peter Olcott wrote:
// // Array2D.h 2005-11-27 5:50 AM //
I actually couldn't get what is "fast" and what is "dynamic" with this Array class. Its not even polymorphic. You could get much more with, say vectors.
Or am I missing something out here?
I have not yet transformed it into the syntax of templates, so it only does unsigned integers at the moment. I will make this conversion some time soon. The memory allocated to this array is dynamically allocated at run-time as opposed to statically allocated at compile-time. Every other dynamically allocated array is either restricted to single dimensional access, or allocates each row separately, making it much slower. When I benchmarked this latter design it was fifty-fold slower than my design.
Allocated is unnecessary.
~ArrayType2D() { delete [] Array; };
works correctly even if Array is NULL.
john
"John Harrison" <jo************ *@hotmail.com> wrote in message news:L2******** *********@newsf e6-win.ntli.net... Peter Olcott wrote: "Neelesh Bodas" <ne***********@ gmail.com> wrote in message news:11******** *************@g 47g2000cwa.goog legroups.com...
Peter Olcott wrote:
// // Array2D.h 2005-11-27 5:50 AM //
I actually couldn't get what is "fast" and what is "dynamic" with this Array class. Its not even polymorphic. You could get much more with, say vectors.
Or am I missing something out here?
I have not yet transformed it into the syntax of templates, so it only does unsigned integers at the moment. I will make this conversion some time soon. The memory allocated to this array is dynamically allocated at run-time as opposed to statically allocated at compile-time. Every other dynamically allocated array is either restricted to single dimensional access, or allocates each row separately, making it much slower. When I benchmarked this latter design it was fifty-fold slower than my design.
Allocated is unnecessary.
~ArrayType2D() { delete [] Array; };
works correctly even if Array is NULL.
john
It turns out that my whole class in unnecessary. Gianni Mariani's
original posting on the other thread is already perfect in every way.
news:q4******** *************** *******@speakea sy.net...
"John Harrison" <jo************ *@hotmail.com> wrote in message news:L2******** *********@newsf e6-win.ntli.net... Peter Olcott wrote: "Neelesh Bodas" <ne***********@ gmail.com> wrote in message news:11******** *************@g 47g2000cwa.goog legroups.com...
Peter Olcott wrote:
// // Array2D.h 2005-11-27 5:50 AM //
I actually couldn't get what is "fast" and what is "dynamic" with this Array class. Its not even polymorphic. You could get much more with, say vectors.
Or am I missing something out here?
I have not yet transformed it into the syntax of templates, so it only does unsigned integers at the moment. I will make this conversion some time soon. The memory allocated to this array is dynamically allocated at run-time as opposed to statically allocated at compile-time. Every other dynamically allocated array is either restricted to single dimensional access, or allocates each row separately, making it much slower. When I benchmarked this latter design it was fifty-fold slower than my design.
Allocated is unnecessary.
It turns out that the whole class is unnecessary, Gianni Mariani's
earlier posting is already perfect in every way.
"Gianni Mariani" <gi*******@mari ani.ws> wrote in message
news:q4******** *************** *******@speakea sy.net... ~ArrayType2D() { delete [] Array; };
works correctly even if Array is NULL.
john
> Peter Olcott wrote:
As usual:
You created something that you say is very fast.
But it has problems in functionality (aka: bugs).
You might analyze the problems of Copy. Especially if it is called
from the copy constructor. (Start with asking: What does Allocated
tell me, what the pointer 'Array' doesn't tell me, if used and initialized
correctly)
--
Karl Heinz Buchegger kb******@gascad .at
Peter Olcott wrote: // // Array2D.h 2005-11-27 5:50 AM // #define UINT unsigned int // // // class ArrayType2D { private: int Width; int Height; int Size; UINT* Array; bool Allocated; void Copy(ArrayType2 D& Array2); public: ArrayType2D(); ArrayType2D(Arr ayType2D& Array2) { Copy(Array2); }; ~ArrayType2D() { if (Allocated) delete [] Array; }; UINT& operator()(cons t UINT ROW, const UINT COL) { return Array[ROW * Width + COL]; } ArrayType2D& operator=(Array Type2D& Array2) { Copy(Array2); return *this; }; UINT* operator&() { return Array; }; const int width() { return Width; }; const int height() { return Height; }; void Allocate(int Height, int Width); }; void ArrayType2D::Co py(ArrayType2D& Array2) { if (this->Allocated) delete [] Array; this->Width = Array2.Width; this->Height = Array2.Height; this->Size = Array2.Size; this->Array = new UINT [Size]; for (int N = 0; N < Size; N++) Array[N] = Array2.Array[N]; this->Allocated = true; } ArrayType2D::Ar rayType2D() { Width = 0; Height = 0; Size = 0; Array = NULL; Allocated = false; } inline void ArrayType2D::Al locate(int Height, int Width) { if (Allocated) delete [] Array; this->Width = Width; this->Height = Height; this->Size = Width * Height; this->Array = new UINT [Size]; this->Allocated = true; }
Try comparing the above class to using std::vector<std ::vector<T> >
You'll be surprise at the results. On some implementations the vector
version is faster then above class.
Also check out the following class: http://code.axter.com/dynamic_2d_array.h
Also, I recommend using [][] access method over operator().
I don't recommend following the FAQ recommendation on this matter. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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