std::deque::front(3)

okay bestie, this is the std::deque::front(3) page from the C++ Standard Libary manual, and it’s short, sweet, and lowkey iconic 💖✨

💖 NAME 💖

std::deque::front — std::deque::front

Yes, the name section is literally just the name twice, and honestly? main character energy 👑💅

✨ Synopsis ✨

reference front();             (1)
const_reference front() const; (2)

Returns a reference to the first element in the container.

🚨 Calling front on an empty container causes undefined behavior. Not me warning you bestie — do not do that, fr fr 😭💀

🎀 Parameters 🎀

(none) — zero parameters, not a single one, she takes nothing 💅

🫶 Return value 🫶

Reference to the first element. — that’s the return value, periodt 🫶✨

🌸 Complexity 🌸

Constant. — no cap, that’s the whole complexity note ✨

🦋 Notes 🦋

For a container c, the expression c.front() is equivalent to *c.begin().

Write that down, bestie 📝💖

🔥 Example 🔥

The following code uses front to display the first element of a std::deque<char>:

       // Run this code

        #include <deque>
        #include <iostream>

        int main()
        {
            std::deque<char> letters{'a', 'b', 'c', 'd', 'e', 'f'};

            if (!letters.empty())
                std::cout << "The first character is '" << letters.front() <<
       "'.\n";
        }

Output:

The first character is 'a'.

Ate, honestly 🍓✨

🌈 See also 🌈

• back — access the last element (public member function) 🦋

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okay that’s the whole page, bestie 🫶 source: http://cppreference.com · version/date: 2024.06.10 · page: std::deque::front(3) ✨💜