std::basic_string<CharT,Traits,Allocator>::begin, std::basic_string<CharT,Traits,Allocator>::cbegin
From cppreference.com
< cpp | string | basic string
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
std::basic_string
(C++23)
(DR*)
(DR*)
basic_string::beginbasic_string::cbegin
(C++11)
(C++23)
(DR*)
(C++23)
(C++23)
(C++20)
(C++20)
(C++23)
(C++20)(C++20)
(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)
(C++11)(C++11)(C++11)
(C++11)(C++11)
(C++14)
(C++11)
Deduction guides (C++17)
iterator begin();
(1)
(noexcept since C++11) (constexpr since C++20)
const_iterator begin() const;
(2)
(noexcept since C++11) (constexpr since C++20)
const_iterator cbegin() const noexcept;
(3)
(since C++11) (constexpr since C++20)
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().
[edit] Parameters
(none)
[edit] Return value
Iterator to the first character.
[edit] Complexity
Constant.
[edit] Notes
libc++ backports cbegin() to C++98 mode.
[edit] Example
Run this code
#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 }
Output:
exemplar e
[edit] See also
returns an iterator to the beginning
(public member function of
(public member function of
std::basic_string_view<CharT,Traits>) [edit]