std::string push_back() method

since C++20

constexpr void push_back( CharT ch );

until C++20

// Non const version only
void push_back( CharT ch );

Appends the given character ch to the end of the string.

Parameters

• ch - the character to append

Return value

(none)

Complexity

Amortized constant - O(1).

Exceptions

If the operation would result in size() > max_size(), throws std::length_error.

In any case, if an exception is thrown for any reason, this function has no effect (strong exception guarantee).  (since C++11)

Example

Main.cpp

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

Output

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