std::unorde...iset::begin,(3)

✨ std::unorde...iset::begin,(3) — C++ Standard Libary ✨

okay so bestie, welcome to the group chat for std::unordered_multiset::begin, 💅 this page is from the C++ Standard Libary manual (yes, that's how it's spelled in the header, leave it 💀), and it's all about getting an iterator that points at the first element. no cap.

🌸 NAME 🌸

std::unordered_multiset::begin, - std::unordered_multiset::begin,

(Yes, the manual lists it twice with those commas. Iconic. 🎀)

✨ Synopsis ✨

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

Returns an iterator to the first element of the unordered_multiset.

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

There's also a lil diagram in the original: range-begin-end.svg 🦋

🎀 Parameters 🎀

• (none) — literally no parameters, bestie. zero. nada. 🫶

💖 Return value 💖

Iterator to the first element. that's it, that's the vibe. ⭐

🔥 Complexity 🔥

Constant. no cap, it's constant energy. ⭐

🧚 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. so like, look but don't touch 💅.

🌈 Example 🌈

// Run this code

#include <iostream>
#include <iterator>
#include <string>
#include <unordered_set>

int main()
{
    const std::unordered_multiset<std::string> words =
    {
        "some", "words", "to", "count",
        "count", "these", "words"
    };

    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
    }
}

🍓 Possible output: 🍓

some:   1
words:  2
to:     1
count:  2
these:  1

👑 See also 👑

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

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mwah 💋 this page came from http://cppreference.com, dated 2024.06.10, and the footer tag is std::unorde...iset::begin,(3). byeee 🫶✨