Using iterator to erase element in vector?

You need to overload the assignment operator Player & operator= (const Player & other) for your class Player. This required because erase requires it's argument to be copyable (it needs to rearrange the other elements of the vector after removal).

What's happening is that the library code removes the player object by shoving each of the array elements above that iterator down one slot. To do that, it copies each object, using operator=. Apparently the class player doesn't have that operator.

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