std::basic_string<CharT,Traits,Allocator>::front (3) - Linux Manuals

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

NAME

std::basic_string<CharT,Traits,Allocator>::front - std::basic_string<CharT,Traits,Allocator>::front

Synopsis

CharT& front(); (since C++11)
const CharT& front() const; (since C++11)

Returns reference to the first character in the string. The behavior is undefined if empty() == true.

Parameters

(none)

Return value

reference to the first character, equivalent to operator[](0).

Complexity

Constant

Example

// Run this code

  #include <iostream>
  #include <string>

  int main()
  {
    {
      std::string s("Exemplary");
      char& f = s.front();
      f = 'e';
      std::cout << s << '\n'; // "exemplary"
    }

    {
      std::string const c("Exemplary");
      char const& f = c.front();
      std::cout << &f << '\n'; // "Exemplary"
    }
  }

Output:

  exemplary
  Exemplary