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Initialising array of pointers

Started by edotorpedo Jan 30, 2003 at 9:39 AM 2 replies 400+ views

Original Post

Jan 30, 2003 at 9:39 AM

I have an array of 4 pointers in a class called QuadTree. In my constructor, how do I initialize each of these pointers to NULL class QuadTree { public: QuadTree(); ~QuadTree(); private: QuadTree *children[4]; } Like this: QuadTree::QuadTree():children(NULL) {} or like this: QuadTree::QuadTree() { for (int i = 0; i < 4; i++) children = NULL; } Thanks, Edo

nail85

Jan 30, 2003 at 10:16 AM

Like this:

class QuadTree {

public:
QuadTree();
~QuadTree();

private:
(QuadTree*) children[4];

}

QuadTree::QuadTree() {

for (int i = 0; i < 4; i++) children = NULL;

}

Trienco

146

Trienco

Jan 30, 2003 at 11:20 AM

quote:
Original post by edotorpedo
QuadTree::QuadTree():children(NULL) {}

bad idea, will only set the pointer to the pointers to null

for-loop. does the right thing and a good compiler will probably optimize it.

memset(children, 0, 4*sizeof(QuadTree*));
probably too "low level" for some peoples taste *g*

[edited by - Trienco on January 30, 2003 12:21:24 PM]

Bullmax

Jan 30, 2003 at 9:59 PM

ZeroMemory( Children, sizeof( QuadTree ) << 2 );

/* Bullmax */
-------------
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