std::ranges...m_view::size(3)

hey bestie 💖 welcome to the C++ Standard Libary manual page for std::ranges...m_view::size(3) — yes, that’s the title, and yes, the manual name really is C++ Standard Libary. buckle up 🎀

✨ NAME ✨

std::ranges::transform_view::size — std::ranges::transform_view::size

🦋 Synopsis 🦋

okay so here’s the signature tea ☕:

constexpr auto size() requires ranges::sized_range<V>;
(since C++20)
constexpr auto size() const requires ranges::sized_range<const V>;
(since C++20)

So what does it do? It returns the number of elements. literally that. 💅 And it gets there by returning ranges::size(base_), where base_ is the underlying view. slay.

🌸 Parameters 🌸

(none) — not a single one, bestie. 🫶

💖 Return value 💖

The number of elements. that’s the whole mood. ✨

⭐ Notes ⭐

If V does not model forward_range, size() might not be well-defined after a call to begin(). so like… be aware, no cap. 😭

🎀 Example 🎀

run this code, bestie:

// Run this code

#include <cctype>
#include <iostream>
#include <ranges>
#include <string>

int main()
{
    std::string s{"The length of this string is 42 characters"};
    auto tv = std::ranges::transform_view{s, [](char c) -> char
    {
        return std::toupper(c);
    }};
    for (auto x : tv)
        std::cout << x;
    std::cout << "\nsize = " << tv.size() << '\n';
}

🌈 Output 🌈

THE LENGTH OF THIS STRING IS 42 CHARACTERS
size = 42

👑 See also 👑

• ranges::size — returns an integer equal to the size of a range; (C++20); (customization point object) ✨
• ranges::ssize — returns a signed integer equal to the size of a range; (C++20); (customization point object) 💅

that’s the page, bestie 🫶 source/version + date tea: http://cppreference.com, 2024.06.10, and the page itself is std::ranges...m_view::size(3). bye 💖