NAME

std::basic_string::pop_back - std::basic_string::pop_back

Synopsis

void pop_back(); (since C++11)
(until C++20)
constexpr void pop_back(); (since C++20)

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.

Example

// Run this code

#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"

See also

push_back appends a character to the end
(public member function)
erase removes characters
(public member function)