From cppreference.com
iteratorbegin(); (1)(noexcept since C++11)
(constexpr since C++20)const_iteratorbegin()const; (2)(noexcept since C++11)
(constexpr since C++20)const_iteratorcbegin()constnoexcept; (3)(since C++11)
(constexpr since C++20)Returns an iterator to the first character of the string.
begin() returns a
or
iterator, depending on the constness of *this.
cbegin() always returns a
iterator. It is equivalent to const_cast<constbasic_string&>(*this).begin().
Parameters
(none)
Return value
Iterator to the first character.
Complexity
Constant.
Notes
libc++ backports cbegin() to C++98 mode.
Example
Run this code
#include<iostream>#include<string>intmain(){std::strings("Exemplar");*s.begin()='e';std::cout<<s<<'\n';autoi=s.cbegin();std::cout<<*i<<'\n';// *i = 'E'; // error: i is a constant iterator}Output:
exemplar e See also
(C++11)
returns an iterator to the end
(public member function)
returns an iterator to the beginning
(public member function of std::basic_string_view<CharT,Traits>)