Difference between revisions of "cpp/container/multiset/begin"
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Latest revision as of 06:40, 28 November 2021
| 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 multiset.
If the multiset is empty, the returned iterator will be equal to end().
Contents |
[edit] Parameters
(none)
[edit] Return value
Iterator to the first element.
[edit] 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.
[edit] Example
Run this code
#include <iostream> #include <iterator> #include <set> #include <string> int main() { const std::multiset<std::string> words = { "some", "not", "sorted", "words", "will", "come", "out", "sorted", }; for (auto it = words.begin(); it != words.end(); ) { auto count = words.count(*it); std::cout << *it << ":\t" << count << '\n'; std::advance(it, count); // all count elements have equivalent keys } }
Output:
come: 1 not: 1 out: 1 some: 1 sorted: 2 will: 1 words: 1
[edit] See also
| (C++11) |
returns an iterator to the end (public member function) |
| (C++11)(C++14) |
returns an iterator to the beginning of a container or array (function template) |
