Regarding the terminate handler,

As i understand it, when something bad happens in code, for example when we dont catch an exception,

terminate() is called, which in turn calls abort()

set_terminate(my_function) allows us to get terminate() to call a user specified function my_terminate.

my question is: where do these functions "live" they don't seem to be a part of the language, but work as if they are present in every single cpp file, without having to include any header file.