Question

Is iterator invalidated after:

string b "Some string";
auto beg_ = b.begin();
auto end_ = b.end();
b.erase(beg_);

Answer 1

Yes, but erase return a valid iterator you can use to continue in a loop :

For the remaining members, the
function returns an iterator of member
type string::iterator referring to the
character that now occupies the
position of the first character
erased, or, if no such character
exists, returns end().

Source : http://www.cplusplus.com/reference/string/string/erase/