Passing Arrays of Structures
March 09, 2003 02:50 PM
Hi, simple question. I have a structure called LineStruct, which contains a few floats, nothing special. I then have an zero-sized array of these:
LineStruct Wall[];
I have a function to which I want to pass the array (a pointer to it anyway).
ObjectClass::TestForIntersection(LineStruct* WallArray[]);
And I try to pass the array to it with:
SomeObjectClassInstance.TestForIntersection(&Wall[]);
And it wont even compile. I''ve never actually learnt about this, eveything I do is what I''ve taught myself over the years, and I took a guess that this would be the way it would work... only it clearly isnt. Can someone tell me what''s wrong?
Warning in life.cpp (8): const Happiness is declared but never used.
"The finger of blame has turned upon itself"
March 09, 2003 03:00 PM
quote: Original post by allsorts46
Hi, simple question. I have a structure called LineStruct, which contains a few floats, nothing special. I then have an zero-sized array of these:
LineStruct Wall[];
I have a function to which I want to pass the array (a pointer to it anyway).
ObjectClass::TestForIntersection(LineStruct* WallArray[]);
And I try to pass the array to it with:
SomeObjectClassInstance.TestForIntersection(&Wall[]);
And it wont even compile. I've never actually learnt about this, eveything I do is what I've taught myself over the years, and I took a guess that this would be the way it would work... only it clearly isnt. Can someone tell me what's wrong?
Warning in life.cpp (8): const Happiness is declared but never used.
ObjectClass::TestForIntersection(LineStruct* wArray);SomeObjectClassInstance.TestForIntersection(Wall); to pass an array you have a couple of options:
int ArrayFunc (int *); // or
int ArrayFunc (int []);
to pass the array just do this in main () :
int main (){ int weaponArray [10] = {0}; ArrayFunc (weaponArray); // enter array name //or you can do this... this is probably what you were thinking of ArrayFunc (&weaponArray[0]);//&weaponArray[0], weaponArray, and &weaponArray all mean the //same thing in this context return 0;} 500
edit: how come C-style comment don't work (ie. comments out all the code under it)?
[edited by - Alpha_ProgDes on March 9, 2003 4:19:43 PM]
March 09, 2003 03:02 PM
Well, an array behaves like a pointer if you pass it as an argument.
In ObjectClass::TestForIntersection(LineStruct* WallArray[]) you say the parameter has to be an array of pointers.
And then you pass it a pointer to an array (= a pointer to a pointer in this context).
So i would change the parameter ''LineStruct* WallArray[]'' to ''LineStruct* WallArray'' and change the argument you pass to ''Wall''
In ObjectClass::TestForIntersection(LineStruct* WallArray[]) you say the parameter has to be an array of pointers.
And then you pass it a pointer to an array (= a pointer to a pointer in this context).
So i would change the parameter ''LineStruct* WallArray[]'' to ''LineStruct* WallArray'' and change the argument you pass to ''Wall''
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