[libcxx-commits] [libcxx] [libc++] Implement `bind_back` (PR #81055)

[Louis Dionne via libcxx-commits]

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@@ -0,0 +1,80 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// <functional>
+
+// template<class F, class... Args>
+//   constexpr unspecified bind_back(F&& f, Args&&... args);
+
+#include <functional>
+
+#include "types.h"
+
+void test() {
+  { // Various failures
+    auto p = std::bind_back(pass, 1);
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ldionne wrote:

If it's fundamental that `pass` is an actual function (and not a function object), I would mention it in a comment and I would define `pass` in this test file so we can see its definition immediately.

https://github.com/llvm/llvm-project/pull/81055