NAME¶

std::set::begin,std::set::cbegin - std::set::begin,std::set::cbegin

Synopsis¶

iterator begin(); (1) (noexcept since C++11)
const_iterator begin() const; (2) (noexcept since C++11)
const_iterator cbegin() const noexcept; (3) (since C++11)

Returns an iterator to the first element of the set.

If the set is empty, the returned iterator will be equal to end().

range-begin-end.svg

Parameters¶

(none)

Return value¶

Iterator to the first element.

Complexity¶

Constant.

Notes¶

Because both iterator and const_iterator are constant iterators (and may in fact be
the same type), it is not possible to mutate the elements of the container through
an iterator returned by any of these member functions.

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

Example¶

// Run this code

#include <algorithm>
#include <iostream>
#include <set>

int main()
{
std::set<int> set{3, 1, 4, 1, 5, 9, 2, 6, 5};
std::for_each(set.cbegin(), set.cend(), [](int x)
{
std::cout << x << ' ';
});
std::cout << '\n';
}

Output:¶

1 2 3 4 5 6 9

See also¶

end returns an iterator to the end
cend (public member function)
(C++11)
begin
cbegin returns an iterator to the beginning of a container or array
(C++11) (function template)
(C++14)