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Document _Ref_fn's *raison d'etre* #4036

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Sep 21, 2023
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Document _Ref_fn's *raison d'etre* #4036

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2 changes: 2 additions & 0 deletions stl/inc/xutility
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Original file line number Diff line number Diff line change
Expand Up @@ -540,6 +540,8 @@ struct less_equal<void> {

template <class _Fx>
struct _Ref_fn { // pass function object by value as a reference
// _Ref_fn is an aggregate so it can be enregistered, unlike reference_wrapper

template <class... _Args>
constexpr decltype(auto) operator()(_Args&&... _Vals) { // forward function call operator
if constexpr (is_member_pointer_v<_Fx>) {
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