Added drop_all

include/spdlog/details/registry.h

@@ -78,6 +78,11 @@ public:
         _loggers.erase(logger_name);
     }
 
+    void drop_all()
+    {
+        std::lock_guard<std::mutex> lock(_mutex);
+        _loggers.clear();
+    }
     std::shared_ptr<logger> create(const std::string& logger_name, sinks_init_list sinks)
     {
         return create(logger_name, sinks.begin(), sinks.end());

include/spdlog/details/spdlog_impl.h

@@ -142,4 +142,8 @@ inline void spdlog::set_sync_mode()
     details::registry::instance().set_sync_mode();
 }
 
+inline void spdlog::drop_all()
+{
+    details::registry::instance().drop_all();
+}