Question

Possible Duplicate:
C++ Overriding… overwriting?

What’s the difference between override and overwrite? I’ve heard them used interchangeably but I suspect that’s incorrect.

Answer 1

override is a C++11 keyword used to override base virtual method:

class A
{
    virtual f(int) {}
};

class B
{
    virtual f(int) override {} // override A::f(int)
};

This lets you make sure that A::F(int) gets overriden, meaning you are not creating new virtual function.
Of course this code won’t compile if the function signature was different.

overwrite is not C++ keyword and it basically means to overwrite some file or text with new one.

The keyword override has been introduced because some times a programmer doesn’t know whether he is overriding or whether he is creating a new virtual method with a different signature.
Using that keyword you either get an error or override virtual method.