C++ template class and operator overloading
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Your assignment operator is broken. First you call delete on internal , invalidating it. Then you call init , which assigns to the elements of internal . You need a reallocation between those two steps.
On another note, your copy constructor is broken too. Set internal to nullptr first. Otherwise, the assignment operator will be calling delete on an unititialized pointer.
On another note, your addition operator is broken. It assumes that the two arrays are the same size. If the second operand is bigger, you will have undefined behavior accessing elements that do not exist.
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