alloc
int **Map;
Map = new int*[ARRAY_WIDTH];
for (int i = 0; i < ARRAY_WIDTH; i++)
Map[ i ] = new int[ARRAY_HEIGHT];
dealloc
for (unsigned int i = 0; i < ARRAY_WIDTH; i++)
{
delete [] Map[i];
}
delete [] Map;
Alloc dealloc
Author
Ive tried this q in the beginner pool but cant get an answer.
If I use this code for my 2d array, is this the correct way to deallocate the array?
I dont''t like ''new'', but this is correct.
//allocint **Map;Map = (INT**)malloc( ARRAY_WIDTH*sizeof(INT*) );for (int i = 0; i < ARRAY_WIDTH; i++) Map[i] = (INT*)malloc( ARRAY_WIDTH*sizeof(INT) );//deallocfor (unsigned int i = 0; i < ARRAY_WIDTH; i++) { free( Map[i] );}free( Map );
I dont''t like ''new'', but this is correct.
//allocint **Map;Map = (INT**)malloc( ARRAY_WIDTH*sizeof(INT*) );for (int i = 0; i < ARRAY_WIDTH; i++) Map[i] = (INT*)malloc( ARRAY_WIDTH*sizeof(INT) );//deallocfor (unsigned int i = 0; i < ARRAY_WIDTH; i++) { free( Map[i] );}free( Map );
If you don't want to bother with the for-loops, but still want a 2D array, try this:
MATRIX.H
and in your code, include MATRIX.H and do something like
[edited by - Kippesoep on January 31, 2003 7:53:33 AM]
MATRIX.H
template <class T, int columns>class MATRIX{public : MATRIX (T *data) { _data = data; } T *operator [] (int row) { return _data + (row * columns); }protected : T *_data;}; and in your code, include MATRIX.H and do something like
int *Map1D = new int [ARRAY_WIDTH * ARRAY_HEIGHT];MATRIX <int, ARRAY_HEIGHT> Map (Map1D);//Here, you can use Map just as your array of arrays:Map [10][15] = 1;//Then, just free it like this:delete [] Map1D; [edited by - Kippesoep on January 31, 2003 7:53:33 AM]
Author
And this reminds my about another problem I have. I've created a class cNode. I’ve done it with templates so I can store any kind of type. It all works good, but when I want to use it in my big project I get link problems.
error LNK2001: unresolved external symbol "public: __thiscall cNode::~cNode(void)" (??1?$cNode@H@@QAE@XZ)
unresolved external symbol "public: __thiscall cNode::cNode(void)" (??0?$cNode@H@@QAE@XZ)
I've tried it out and it works in my test project with only it in it.
This is my first time making a template, any suggestions for changes are appreciated.
[edited by - leadorn on January 31, 2003 1:30:10 PM]
error LNK2001: unresolved external symbol "public: __thiscall cNode::~cNode(void)" (??1?$cNode@H@@QAE@XZ)
unresolved external symbol "public: __thiscall cNode::cNode(void)" (??0?$cNode@H@@QAE@XZ)
I've tried it out and it works in my test project with only it in it.
This is my first time making a template, any suggestions for changes are appreciated.
I use it like this, cNode<int> View;///Headertemplate <class Type>class cNode{public: struct sNode { Type *item; sNode *Next; }; cNode(); ~cNode(); bool Add(Type *item); bool GetItem(Type **item); void ResetCount(); private: //Front of linked list. sNode *Front; sNode *End; sNode *NodePitch; bool bLocked; };//cpptemplate <class Type>cNode<Type>::cNode(){ End = Front = 0; bLocked = false;}template <class Type>cNode<Type>::~cNode(){ sNode *Pitch; sNode *TempPitch; Pitch = Front; while(Pitch != 0) { TempPitch = Pitch; Pitch = Pitch->Next; delete TempPitch->item; delete TempPitch; }//End of while(ChannelPitch != 0) }template <class Type>bool cNode<Type>::Add(Type *item){ if(bLocked == true) return false; if (item == 0) return false; if(Front == 0) { Front = new sNode; if(Front == 0) return false; Front->Next = 0; End = Front; //Set input. End->item = item; NodePitch = Front; return true; } else { End->Next = new sNode; if(End->Next == 0) return false; End->Next->Next = 0; End = End->Next; //Set input. End->item = item; return true; } return false;}template <class Type>bool cNode<Type>::GetItem(Type **item){ //Lock class. bLocked = true; if(NodePitch == 0) return false; *item = NodePitch->item; NodePitch = NodePitch->Next; return true;}template <class Type>void cNode<Type>::ResetCount(){ NodePitch = Front; } [edited by - leadorn on January 31, 2003 1:30:10 PM]
Author
aha. so i have to put all the code for the class in the header file. Oki ill try that.
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