std::string pop_back() method

since C++11

// Non const version only
void pop_back();

since C++20

// Non const version only
constexpr void pop_back();

Removes the last character from the string as if by

erase(end()-1)

Undefined Behavior

Calling pop_back() on an empty string is undefined behavior

.

Parameters

(none)

Return value

(none)

Complexity

Constant - O(1).

Exceptions

(none)

Example

Main.cpp

#include <cassert>
#include <string>
#include <iomanip>
#include <iostream>
 
int main()
{
    std::string str("Short string!");
    std::cout << "before=" << quoted(str) << '\n';
    assert(str.size() == 13);
 
    str.pop_back();
    std::cout << " after=" << quoted(str) << '\n';
    assert(str.size() == 12);
 
    str.clear();
//  str.pop_back(); // UB!
}

Output

before="Short string!"
 after="Short string"