std::set<Key,Compare,Allocator>::begin, std::set<Key,Compare,Allocator>::cbegin
From cppreference.com
| iterator begin(); |
(noexcept since C++11) | |
| const_iterator begin() const; |
(noexcept since C++11) | |
| const_iterator cbegin() const noexcept; |
(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().
Contents |
Parameters
(none)
Return value
Iterator to the first element.
Complexity
Constant.
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.
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
| (C++11) |
returns an iterator to the end (public member function of std::set<Key,Compare,Allocator>)
|
