std::vector::size(3)

✨ std::vector::size(3) ✨

Bestie, welcome to the <vector> chapter of the C++ Standard Library, where we're about to have a whole moment over std::vector::size. Like, this function is THAT girl — she tells you exactly how many elements are in your container, no cap. 🎀

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🌸 Synopsis 🌸

size_type size() const;  (noexcept since C++11)
                         (constexpr since C++20)

Okay so what does she actually do? She returns the number of elements in the container, which is literally std::distance(begin(), end()). That's the vibe check for your vector's population. 💅

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🦋 Parameters 🦋

(none) — she takes nothing, she gives everything. Periodt. ✨

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💖 Return value 💖

The number of elements in the container. That's it. That's the whole tea. 🍵

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🔥 Complexity 🔥

Constant. Like, O(1) constant. She's fast, she's efficient, she did not come to play. ⚡

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🌈 Example 🌈

Not me about to show you the cutest little code block where size displays the number of elements in a std::vector<int>:

// Run this code

#include <vector>
#include <iostream>

int main()
{
    std::vector<int> nums {1, 3, 5, 7};

    std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output:

nums contains 4 elements.

Slay. Look at her go. 👑

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👑 See also 👑

• capacity — returns the number of elements that can be held in currently allocated storage (public member function) 🫶
• empty — checks whether the container is empty (public member function) 💀
• max_size — returns the maximum possible number of elements (public member function) 🌟
• resize — changes the number of elements stored (public member function) 🧚
• ssize (C++17, C++20) — returns the size of a container or array (function template) 🌸

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ngl bestie, size is lowkey the main character of vector member functions. She's giving "I know exactly how many elements are in this container" energy and honestly? We're obsessed. 💜

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Source: cppreference.com · Version: 2024.06.10 · Section: std::vector::size(3)

Mwah 💋 go forth and count your elements, queen. 🦋✨