From 388cf58b31d6480007901785851e6369b0efe64b Mon Sep 17 00:00:00 2001
From: comex <comexk@gmail.com>
Date: Tue, 29 Dec 2020 14:26:16 -0500
Subject: k_priority_queue: Fix concepts use

- For `std::same_as`, add missing include of `<concepts>`.

- For `std::convertible_to`, create a replacement in `common/concepts.h`
  and use that instead.

  This would also be found in `<concepts>`, but unlike `std::same_as`,
  `std::convertible_to` is not yet implemented in libc++, LLVM's STL
  implementation - not even in master.  (In fact, `std::same_as` is the
  *only* concept currently implemented.  For some reason.)
---
 src/common/concepts.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/common')

diff --git a/src/common/concepts.h b/src/common/concepts.h
index 5bef3ad67..aa08065a7 100644
--- a/src/common/concepts.h
+++ b/src/common/concepts.h
@@ -31,4 +31,8 @@ concept DerivedFrom = requires {
     std::is_convertible_v<const volatile Derived*, const volatile Base*>;
 };
 
+// TODO: Replace with std::convertible_to when libc++ implements it.
+template <typename From, typename To>
+concept ConvertibleTo = std::is_convertible_v<From, To>;
+
 } // namespace Common
-- 
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