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deduction guides for std::function_ref - cppreference.com
template< class F >
function_ref( F* ) -> function_ref<F>;
(1) (since C++26) template< auto f >
function_ref( std::nontype_t<f> ) -> function_ref</*see below*/>; (2) (since C++26) template< auto f, class T >
function_ref( std::nontype_t<f>, T&& ) -> function_ref</*see below*/>; (3) (since C++26) 1)
This overload participates in overload resolution only if
std::is_function_v<F>
is
true
.
3)
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)>.
[edit] Example
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