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What is wrong with my template function?

Leiarchy9 · 2004-02-09T22:26:48

Main.h #ifndef _Main_h #define _Main_h template<class dataType> class CArray { dataType * _array; int _size; public: CArray(void): _size(20) { _array = new dataType[_size]; } CArray(int paramSize): _size(paramSize) { _array = new dataType[_size]; } ~CArray(void) { if( _array != NULL ) { delete [] _array; } _array = NULL; } operator dataType*(void) { return _array; } dataType & operator[](int element) { return _array[element]; } void resize(int newSize) { if( _array != NULL ) { delete [] _array; } _array = NULL; _size = newSize; _array = new dataType[newSize]; } void insert(int element, dataType value) { for( int index = _size - 1; index > element; index-- ) { _array[index] = _array[index - 1]; } _array[element] = value; } void clear(dataType zero) { for( int index = 0; index < _size; index++ ) { _array[index] = zero; } } int GetSize(void) const { return _size; } }; #endif Main.cpp #include <iostream> #include <cstdlib> #include <time.h> #include "Main.h" using std::cout; using std::cin; using std::endl; template<typename dataType, const int MAX, dataType value> void Process(dataType*&); template<typename dataType, const int MAX> void Process2(dataType*); int main(void) { srand( (int)time(NULL) ); CArray<int> array(9); Process<int, array.GetSize(), int(rand() % 10)>(array); cin.get(); return EXIT_SUCCESS; } template<typename dataType, int MAX, dataType value> void Process( dataType *& pArray ) { for( int index = 0; index < MAX; index++ ) { pArray[index] = value; } } template<typename dataType, const int MAX> void Process2( dataType * pArray ) { for( int index = 0; index < MAX; index++ ) { cout << pArray[index] << endl; } } -------- "Do you believe in Ghost?"

General and Gameplay Programming Programming

Started by Leiarchy9 February 07, 2004 11:27 PM

21 comments, last by Leiarchy9 20 years, 2 months ago

Leiarchy9

100

Author

February 09, 2004 09:44 PM

I now got my code working but there was a reason why I had Process() take a dataType*& was because I wanted to change the pointer''s value like so:

template<typename dataType, int MAX>void Process( dataType * pArray, dataType paramValue ){     for( int index = 0; index < MAX; index++ )     {             pArray[index] = paramValue;     }}

Now you said that I only need to use the reference sign when I''m changing the pointer itself not the data it points to. I''m assuming that what you mean by ''the pointer itself'' is ''pArray''? So that would mean that ''pArray(index]'' would be the data it points to right?

--------
"Do you believe in Ghost?"

--------"Do you believe in Ghost?"

Chris Hare

462

February 09, 2004 10:05 PM

Right.

int array[5];array is a constant pointer, its value being the start of the array, and array[0] is the first element, the element array points to.You would need a *& if you wanted to do thisvoid allocate_mem(int*& array){   array = new int[5];}, becausevoid allocate_mem(int* array){   array = new int[5];}wouldn''t do the job, as array wouldn''t be changed outside the function, since the pointer is passed by value.

blah blah blah.

Leiarchy9

100

Author

February 09, 2004 10:26 PM

I understand now. Thanks.

--------
"Do you believe in Ghost?"

--------"Do you believe in Ghost?"

What is wrong with my template function?

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