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

See also


back accesses the last character
        (public member function)
(C++11)

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