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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../utility/functional/function_ref.html below:

std::function_ref - cppreference.com

template< class... >
class function_ref; // not defined

(1) (since C++26) template< class R, class... Args >

class function_ref<R(Args...)>;
template< class R, class... Args >
class function_ref<R(Args...) noexcept>;
template< class R, class... Args >
class function_ref<R(Args...) const>;
template< class R, class... Args >

class function_ref<R(Args...) const noexcept>;
(2) (since C++26)

Class template std::function_ref is a non-owning function wrapper. std::function_ref objects can store and invoke reference to Callable target - functions, lambda expressions, bind expressions, or other function objects, but not pointers to member functions and pointers to member objects. std::nontype can be used to construct std::function_ref by passing function pointers, pointers to member functions, and pointers to member objects.

std::function_refs supports every possible combination of cv-qualifiers (excluding volatile), and noexcept-specifiers provided in its template parameter.

Every specialization of std::function_ref is a TriviallyCopyable type that satisfies copyable.

[edit] Member types Member Definition BoundEntityType (private) unspecified TriviallyCopyable type that satisfies copyable and is capable of storing a pointer to object value or pointer to function value
(exposition-only member type*) FunctionPointerType (private) R(*)(BoundEntityType , Args&&...) noexcept(noex )

where noex is true if noexcept is present in function signature as part of the template parameter of std::function_ref, false otherwise
(exposition-only member type*)

[edit] Data members Member Definition BoundEntityType bound-entity a bound entity object
(exposition-only member object*) FunctionPointerType thunk-ptr a stored pointer to function
(exposition-only member object*) [edit] Member functions [edit] Deduction guides [edit] Notes [edit] Example [edit] See also copyable wrapper of any copy constructible callable object
(class template) [edit] copyable wrapper of any copy constructible callable object that supports qualifiers in a given call signature
(class template) [edit] move-only wrapper of any callable object that supports qualifiers in a given call signature
(class template) [edit] value construction tag
(tag)[edit]

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