deductiongu...function_ref(3)

✨ NAME ✨

okay so bestie, we're deep in deductiongu...function_ref(3) from the C++ Standard Libary — yes, the header spells it “Libary,” and honestly? iconic. Buckle up, because this page is all about deduction guides for std::function_ref. 💅

The name is literally deductionguidesforstd::function_ref — and the description? Also deductionguidesforstd::function_ref. No notes, that's the vibe. 🫶

🌸 Synopsis 🌸

Defined in header <functional> — yes bestie, <functional>, as in functional things. The deduction guides are giving:

template< class F >
(1) (since C++26)
function_ref( F* ) -> function_ref<F>;

template< auto f >
(2) (since C++26)
function_ref( std::nontype_t<f> ) -> function_ref</*see below*/>;

template< auto f, class T >
(3) (since C++26)
function_ref( std::nontype_t<f>, T&& ) -> function_ref</*see below*/>;

Here's the tea on each guide, fr fr:

1. (1) (since C++26) — This overload participates in overload resolution only if std::is_function_v<F> is true. ✨
2. (2) (since C++26) — Let type F be std::remove_pointer_t<decltype(f)>. This overload participates in overload resolution only if std::is_function_v<F> is true. The deduced type is std::function_ref<F>. 🌟
3. (3) (since C++26) — Let type F be decltype(f). This overload participates in overload resolution only if:
   • F is of the form R(G::*)(A...) noexcept(E) (optionally cv-qualified, optionally noexcept, optionally lvalue reference qualified) for a type G, or
   • F is of the form M G::* for a type G and an object type M, in which case let R be std::invoke_result_t<F, T&>, A... be an empty pack, and E be false, or
   • F is of the form R(*)(G, A...) noexcept(E) for a type G.

The deduced type is std::function_ref<R(A...) noexcept(E)>. Periodt. 🔥

🌈 Example 🌈

This section is incomplete Reason: no example

the example section is literally giving unfinished homework 😭

🎀 Category 🎀

• Todo no example

That's the whole category, bestie — Todo no example. 🫶

mwah 💋 — this cutie came from http://cppreference.com, dated 2024.06.10, and the page is deductiongu...function_ref(3). Slay responsibly, bestie. 🧚