std::forwar...st::max_size(3)

🌸 std::forward_list::max_size ✨

okay so this is the std::forward_list::max_size page from the C++ Standard Libary — yes bestie, that's the C++ Standard Libary, the typo is canon now, we don't fix it, we respect it 💅. It lives in the std::forwar...st::max_size(3) section of the manual (the middle got ate by the manpage formatter, it's giving "my name is elided for your convenience" energy 😭).

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💖 NAME 💖

std::forward_list::max_size — literally just std::forward_list::max_size. That's it. That's the name. Iconic minimalism 🎀.

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🦋 Synopsis 🦋

size_type max_size() const noexcept;  (since C++11)

okay so what does it actually do? It returns the maximum number of elements the container is able to hold due to system or library implementation limitations, i.e. std::distance(begin(), end()) for the largest container. like, the absolute theoretical ceiling, the final boss of how much this thing can carry 👑.

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🍓 Parameters 🍓

(none) — she takes nothing, she gives everything, no cap ✨.

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🌈 Return value 🌈

Maximum number of elements. that's the whole return value. a number. a big one, probably. slay 🔥.

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🧚 Complexity 🧚

Constant. O(1) behavior, we love a low-effort queen 💅.

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💜 Notes 💜

okay so listen, this is the important bit 🫶 — this value typically reflects the theoretical limit on the size of the container, at most std::numeric_limits<difference_type>::max().

⚠️ at runtime, the size of the container may be limited to a value smaller than max_size() by the amount of RAM available. so like, she could hold that much, but your laptop said "bestie no" 😭💀

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⭐ Example ⭐

// Run this code — go off, run it, live your truth 🌸

#include <iostream>
#include <locale>
#include <forward_list>

int main()
{
    std::forward_list<char> p;
    std::forward_list<long> q;

    std::cout.imbue(std::locale("en_US.UTF-8"));
    std::cout << std::uppercase
              << "p.max_size() = " << std::dec << p.max_size() << " = 0x"
              << std::hex << p.max_size() << '\n'
              << "q.max_size() = " << std::dec << q.max_size() << " = 0x"
              << std::hex << q.max_size() << '\n';
}

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🔥 Possible output 🔥

p.max_size() = 1,152,921,504,606,846,975 = 0xFFF,FFF,FFF,FFF,FFF
q.max_size() = 1,152,921,504,606,846,975 = 0xFFF,FFF,FFF,FFF,FFF

look at those numbers. one quintillion and change. she ate and left absolutely zero crumbs 💅✨. and notice both char and long give the exact same answer — the implementation-level limit is what's talking here, not the element size, iykyk 🦋.

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💖 cute little sign-off 💖 — this whole vibe check came from http://cppreference.com, dated 2024.06.10, filed under std::forwar...st::max_size(3). go forth and query your sizes, bestie, ily 🫶🎀