[libcxx-commits] [libcxx] [libc++] Implement ranges::iota (PR #68494)

[Konstantin Varlamov via libcxx-commits]

================
@@ -1172,6 +1190,30 @@ struct Proxy {
     requires std::three_way_comparable_with<std::decay_t<T>, std::decay_t<U>> {
     return lhs.data <=> rhs.data;
   }
+
+  // Needed to allow certain types to be weakly_incrementable
+  constexpr Proxy& operator++()
+    requires(std::weakly_incrementable<std::remove_reference_t<T>>)
+  {
+    ++data;
+    return *this;
+  }
+
+  constexpr Proxy operator++(int)
+    requires(std::incrementable<std::remove_reference_t<T>>)
+  {
+    Proxy tmp = *this;
+    operator++();
+    return tmp;
+  }
+
+  void operator++(int)
+    requires(std::weakly_incrementable<std::remove_reference_t<T>> && !std::incrementable<std::remove_reference_t<T>>)
+  {
+    Proxy tmp = *this;
+    operator++();
+    return tmp;
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var-const wrote:

Perhaps I'm missing something, but it seems like it shouldn't return anything (the return type is `void`)?

https://github.com/llvm/llvm-project/pull/68494