From 9d3dde0900bc8e8b09a4f54e7b9ee7263f57acb0 Mon Sep 17 00:00:00 2001
From: Matthias Moulin <matthias.moulin@gmail.com>
Date: Thu, 22 Apr 2021 21:19:54 +0200
Subject: [PATCH] Made mutex member variable mutable

Classes inheriting from `base_sink` can now lock the base mutex inside their `const` member methods (e.g., basic accessors).
---
 include/spdlog/sinks/base_sink.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/spdlog/sinks/base_sink.h b/include/spdlog/sinks/base_sink.h
index bf5072f8..0647f0c4 100644
--- a/include/spdlog/sinks/base_sink.h
+++ b/include/spdlog/sinks/base_sink.h
@@ -37,7 +37,7 @@ public:
 protected:
     // sink formatter
     std::unique_ptr<spdlog::formatter> formatter_;
-    Mutex mutex_;
+    mutable Mutex mutex_;
 
     virtual void sink_it_(const details::log_msg &msg) = 0;
     virtual void flush_() = 0;