std::basic_string::front(3) C++ Standard Libary std::basic_string::front(3) NAME std::basic_string::front - std::basic_string::front Synopsis CharT& front(); (1) (constexpr since C++20) const CharT& front() const; (2) (constexpr since C++20) Returns reference to the first character in the string. The behavior is undefined if empty() is true. Parameters (none) Return value Reference to the first character, equivalent to operator[](0). Complexity Constant. Notes In libstdc++, front() is not available in C++98 mode. Example // Run this code #include <iostream> #include <string> int main() { std::string s("Exemplary"); char& f1 = s.front(); f1 = 'e'; std::cout << s << '\n'; // "exemplary" std::string const c("Exemplary"); char const& f2 = c.front(); std::cout << &f2 << '\n'; // "Exemplary" } Output: exemplary Exemplary Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 534 C++98 std::basic_string did not have the member added function front() See also back accesses the last character (DR*) (public member function) front accesses the first character (public member function of std::basic_string_view<CharT,Traits>) http://cppreference.com 2024.06.10 std::basic_string::front(3)
NAME | Synopsis | Parameters | Return value | Complexity | Notes | Example | Output: | See also
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