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std::basic_string<CharT,Traits,Allocator>::push_back

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void push_back( CharT ch );
(constexpr since C++20)

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

Contents

[edit] Parameters

ch - the character to append

[edit] Return value

(none)

[edit] Complexity

Amortized constant.

[edit] Exceptions

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

If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee).

[edit] Example

#include <iomanip>
#include <iostream>
#include <string>
 
int main()
{
    std::string str{"Short string"};
    std::cout << "1) " << std::quoted(str) << ", size: " << str.size() << '\n';
 
    str.push_back('!');
    std::cout << "2) " << std::quoted(str) << ", size: " << str.size() << '\n';
}

Output:

1) "Short string", size: 12
2) "Short string!", size: 13

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 7 C++98 (1) the description was missing in the C++ standard
(2) the parameter type was const CharT
(1) description added
(2) changed to CharT
LWG 847 C++98 there was no exception safety guarantee added strong exception safety guarantee

[edit] See also

removes the last character
(public member function) [edit]