Confused Deleting 2D array

This is a discussion on Confused Deleting 2D array within the C++ Programming forums, part of the General Programming Boards category; I've read through similar posts on deleting 2D arrays, but still a little confused. I have a global array that ...

  1. #1
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    Confused Deleting 2D array

    I've read through similar posts on deleting 2D arrays, but still a little confused.

    I have a global array that I want to delete in a funtion named DeleteGroup():

    Code:
    //global variables:
    int FragArray[75][4];
    char PKAGroupName[500];
    char PKAGroupFrag[500];
    
    void DeleteGroup() {
     
    	PKAGroupName[0] = '\0';
    	PKAGroupFrag[0] = '\0';
    
    	for (int i = 0; i < 75; i++){
    		delete[] FragArray[i];
    	}
    
    	delete[] FragArray;
    
    	return;
    
    }
    
    other function {
     sets values in array,
    calls DeleteGroup() to clear/delete Frag array when finished
    }
    When I compile my code, I get the warning:
    Code:
    warning C4154: deletion of an array expression; conversion to pointer supplied
    I can't figure out what I'm doing wrong?

  2. #2
    and the hat of wrongness Salem's Avatar
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    > I've read through similar posts on deleting 2D arrays, but still a little confused.
    You don't delete arrays. If an array goes out of scope, the compiler manages that for you.

    You only delete things which you did new on.
    You only delete[] things which you did new[] on.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
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    Thanks again Salem. I'll read up on new[]

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