[libcxx-commits] [libcxx] [libc++][ranges] export `std::ranges::range_adaptor_closure` (PR #89793)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxx

Author: Xiaoyang Liu (xiaoyang-sde)

<details>
<summary>Changes</summary>

## Abstract

This pull request exports the `std::ranges::range_adaptor_closure` class template implemented in #<!-- -->89148.

```cpp
// [range.adaptor.object], range adaptor objects
template<class D>
  requires is_class_v<D> && same_as<D, remove_cv_t<D>>
class range_adaptor_closure { };
```

## Reference

- [P2387R3: Pipe support for user-defined range adaptors](https://wg21.link/P2387R3)
- [C++ Draft Standard: [range.adaptor.object]](https://eel.is/c++draft/range.adaptor.object)
- #<!-- -->89148

---
Full diff: https://github.com/llvm/llvm-project/pull/89793.diff


1 Files Affected:

- (modified) libcxx/modules/std/ranges.inc (+3-1) 


``````````diff
diff --git a/libcxx/modules/std/ranges.inc b/libcxx/modules/std/ranges.inc
index 82c7d99f8979a8..7d215867a4317f 100644
--- a/libcxx/modules/std/ranges.inc
+++ b/libcxx/modules/std/ranges.inc
@@ -138,8 +138,10 @@ export namespace std {
     }
 #endif // _LIBCPP_HAS_NO_LOCALIZATION
 
+#if _LIBCPP_STD_VER >= 23
     // [range.adaptor.object], range adaptor objects
-    // using std::ranges::range_adaptor_closure;
+    using std::ranges::range_adaptor_closure;
+#endif
 
     // [range.all], all view
     namespace views {

``````````

</details>


https://github.com/llvm/llvm-project/pull/89793