std::array::operator[](3)

💅 std::array::operator[](3) 💅

okay so bestie, this iconic page is from the C++ Standard Libary manual and it’s all about std::array::operator[] — std::array::operator[]. Get ready for bracket access realness. 💖

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🌸 NAME 🌸

std::array::operator[] — std::array::operator[]

✨ Synopsis ✨

reference operator[]( size_type pos );             (1) (since C++11)
                                                   (constexpr since C++17)
const_reference operator[]( size_type pos ) const; (2) (since C++11)
                                                   (constexpr since C++14)

Returns a reference to the element at specified location pos. No bounds checking is performed. periodt.

bestie, that “no bounds checking” thing is real — it’s not checking, it’s just vibing. 👀

🎀 Parameters 🎀

• pos — position of the element to return.

🫶 Return value 🫶

Reference to the requested element.

⚡ Complexity ⚡

Constant. iconic, no notes. ✨

💜 Notes 💜

Unlike std::map::operator[], this operator never inserts a new element into the container. No sneaky insertion, no new element, nada.

Accessing a nonexistent element through this operator is undefined behavior. So like, do not do that, fr fr 😭💀.

🌈 Example 🌈

The following code uses operator[] to read from and write to a std::array<int>:

// Run this code

#include <array>
#include <iostream>

int main()
{
    std::array<int,4> numbers{2, 4, 6, 8};

    std::cout << "Second element: " << numbers[1] << '\n';

    numbers[0] = 5;

    std::cout << "All numbers:";
    for (auto i : numbers)
        std::cout << ' ' << i;
    std::cout << '\n';
}

Output:

Second element: 4
All numbers: 5 4 6 8

👑 See also 👑

• at — access specified element with bounds checking (public member function).

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kisses bestie 💋 this page is sourced from http://cppreference.com, version/date 2024.06.10, and it’s std::array::operator[](3) — bye 💖✨