std::ranges...tor::satisfy(3)

💖 std::ranges...tor::satisfy(3) 💖

okay so bestie, welcome to the <rainbow>std::ranges...tor::satisfy(3)</rainbow> page from the C++ Standard Libary manual — yes, that’s the spelling over there, no cap 😭. It’s giving very niche C++20 internals and we’re gonna read it together 💅✨.

🌸 NAME 🌸

• std::ranges::join_view::iterator::satisfy — std::ranges::join_view::iterator::satisfy. Yep, it says the same thing twice, and we respect that 🫶💅.

✨ Synopsis ✨

The signature is constexpr void satisfy(); — (since C++20) — and it’s tagged (exposition only*) 👀.

What it does: skips over empty inner ranges and initializes the underlying iterator inner_. Literally that’s the assignment, bestie 🎀.

Let the constant /*ref-is-glvalue*/ be std::is_reference_v<ranges::range_reference_t<Base>>.

The function body is equivalent to this iconic little code block 🔥:

auto update_inner = [this](const ranges::iterator_t<Base>& x) -> auto&&
{
    if constexpr (/*ref-is-glvalue*/)     // *x is a reference
        return *x;
    else
        return parent_->inner_./*emplace-deref*/(x);
};

for (; outer_ != ranges::end(parent_->base_); ++outer_)
{
    auto&& inner = update_inner(outer_);
    inner_ = ranges::begin(inner);
    if (inner_ != ranges::end(inner))
        return;
}

if constexpr (/*ref-is-glvalue*/)
    inner_ = InnerIter();

🎀 Parameters 🎀

• (none) — not a single parameter, bestie 🙈.

🦋 Return value 🦋

• (none) — it returns literally nothing, periodt 💀.

mwah 💋 this cute lil page came from http://cppreference.com, dated 2024.06.10, and it’s std::ranges...tor::satisfy(3) — bye bestie, go slay some ranges 🌈👑.