[libcxx-commits] [libcxx] [libc++][ranges] P1223R5: `find_last` (PR #99312)

[nicole mazzuca via libcxx-commits]

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@@ -102,6 +102,26 @@ namespace ranges {
     constexpr borrowed_iterator_t<R>
       find_if_not(R&& r, Pred pred, Proj proj = {});                                                      // since C++20
 
+  template<forward_iterator I, sentinel_for<I> S, class T, class Proj = identity>
+    requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
+    constexpr subrange<I> find_last(I first, S last, const T& value, Proj proj = {});                     // since C++23
+  template<forward_range R, class T, class Proj = identity>
+    requires
+      indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
+    constexpr borrowed_subrange_t<R> find_last(R&& r, const T& value, Proj proj = {});                   // since C++23
+  template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
+           indirect_unary_predicate<projected<I, Proj>> Pred>
+    constexpr subrange<I> find_last_if(I first, S last, Pred pred, Proj proj = {});                      // since C++23
+  template<forward_range R, class Proj = identity,
+           indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
+    constexpr borrowed_subrange_t<R> find_last_if(R&& r, Pred pred, Proj proj = {});                     // since C++23
+  template<forward_iterator I, sentinel_for<I> S, class Proj = identity,
+           indirect_unary_predicate<projected<I, Proj>> Pred>
+    constexpr subrange<I> find_last_if_not(I first, S last, Pred pred, Proj proj = {});                  // since C++23
+  template<forward_range R, class Proj = identity,
+           indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
+    constexpr borrowed_subrange_t<R> find_last_if_not(R&& r, Pred pred, Proj proj = {});                 // since C++23
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strega-nil wrote:

It is just as hard to read in the standard, but definitely can do 😝 

https://github.com/llvm/llvm-project/pull/99312