An access violation is a type of run-time error in which the program reads or writes to non-allocated memory. In the example below, an array is declared, after which the space in memory beyond it is set to zero:


int main()

{

  int v[1];

  v[1] = 0; //Access violation!

}

Access violations are not always detected (try the code above, it might just reach the end) and therefore difficult to debug.

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(C++) access violation