std::basic_string<CharT,Traits,Allocator>:: begin, std::basic_string<CharT,Traits,Allocator>:: cbegin

Returns an iterator to the first character of the string.

begin() returns a mutable or constant iterator, depending on the constness of * this .

cbegin() always returns a constant iterator. It is equivalent to const_cast < const basic_string & > ( * this ) . begin ( ) .

Parameters

(none)

Return value

Iterator to the first character.

Complexity

Constant.

Notes

libc++ backports cbegin() to C++98 mode.

Example

#include <iostream>
#include <string>
 
int main()
{
    std::string s("Exemplar");
    *s.begin() = 'e';
    std::cout << s << '\n';
 
    auto i = s.cbegin();
    std::cout << *i << '\n';
//  *i = 'E'; // error: i is a constant iterator
}

exemplar
e

See also