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Showing content from https://cplusplus.com/reference/string/basic_string/pop_back/ below:

public member function

<string>

std::basic_string::pop_back

Delete last character

Erases the last character of the basic_string, effectively reducing its length by one.

Parameters none

Return value none

Example 
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// string::pop_back
#include <iostream>
#include <string>

int main ()
{
  std::string str ("hello world!");
  str.pop_back();
  std::cout << str << '\n';
  return 0;
}



Complexity Unspecified, but generally constant.

Iterator validity Any iterators, pointers and references related to this object may be invalidated.

Data races The object is modified.

Exception safety If the basic_string is empty, it causes undefined behavior.
Otherwise, the function never throws exceptions (no-throw guarantee).

See also
basic_string::back
Access last character (public member function)
basic_string::push_back
Append character to string (public member function)
basic_string::erase
Erase characters from string (public member function)

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