_BLOCK_TYPE_IS_VALID(pHead->(nBlockUse) debug assertion error
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Thread: _BLOCK_TYPE_IS_VALID(pHead->(nBlockUse) debug assertion error

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  1. #1
    Join Date
    Dec 2005
    Posts
    251

    _BLOCK_TYPE_IS_VALID(pHead->(nBlockUse) debug assertion error

    EDIT: NEVER MIND, I totally blanked out and didn't realize that I was actually trying to delete an array that WASN"T created on the heap! IGNORE -> I can't figure out why I'm getting a _BLOCK_TYPE_IS_VALID debug assertion error. It's associated with the last line of code that deletes memory created on the heap. The program adds 2 to the ptr pointer, subscripts it with ptr[0], displays the value, then subtracts 2 to get the pointer back to the beginning of the array, and attempts to free the memory. But I get the error.

    Code:
    // Subscripting a pointer to an array after pointer arithmetic.
    
    #include <iostream>
    using namespace std;
    
    int main()
    {
       int intArray[5] {0, 1, 2, 3, 4};
       int *ptr = new int[5];
       ptr = intArray;
      
       cout << "intArray: {";
       for (int i = 0; i < 5; ++i)
          cout << ptr[i] << " ";
       cout << "}\n\n";
    
       cout << "Subscripting a pointer to intArray: \nptr[0]: " << ptr[0] << endl << endl;
    
       cout << "Adding 2 to ptr: (ptr + 2)\n";
       ptr += 2;
       cout << "ptr[0] is now " << ptr[0] << endl << endl;
    
       cout << "Subtracting 2 from ptr: (ptr - 2)\n";
       ptr -= 2;
       cout << "ptr[0] is now " << ptr[0] << "\n\n";
    
       delete [] ptr; // Gets a _BLOCK_TYPE_IS_VALID(pHead->nBlockUse) debug assertion failure error
          
       return 0;
    }
    Last edited by spiritualfields; February 26th, 2014 at 05:08 AM.

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