From: Samuel Just <sjust@redhat.com>
Date: Sat, 14 Oct 2023 20:27:51 +0000 (-0700)
Subject: common/fmt_common: add has_formatter concept
X-Git-Tag: v19.3.0~296^2~10
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=83cb1c730a8ad08796b6f36a10673faf3b8bcad2;p=ceph.git

common/fmt_common: add has_formatter concept

Signed-off-by: Samuel Just <sjust@redhat.com>
---

diff --git a/src/common/fmt_common.h b/src/common/fmt_common.h
index 5db8bac43cd7..1a2a6eac9357 100644
--- a/src/common/fmt_common.h
+++ b/src/common/fmt_common.h
@@ -15,6 +15,10 @@
  * has a begin()/end() method pair. This is a problem because we have
  * such classes in Crimson.
  */
+
+template <typename T>
+concept has_formatter = fmt::has_formatter<T, fmt::format_context>::value;
+
 /**
  * Tagging classes that provide support for default fmtlib formatting,
  * by having either