std::basic_string<CharT,Traits,Allocator>::pop_back
From cppreference.com
                    
                                        
                    < cpp | string | basic string
                    
                                                            
                    | void pop_back(); | (since C++11) | |
Removes the last character from the string.
Equivalent to erase(end()-1). The behavior is undefined if the string is empty.
Parameters
(none)
Return value
(none)
Complexity
Constant.
Exceptions
Throws nothing.
See also
| appends a character to the end (public member function) | |
| removes characters (public member function) |