flush in logger

include/spdlog/details/logger_impl.h

@@ -312,4 +312,8 @@ inline void spdlog::logger::_set_formatter(formatter_ptr msg_formatter)
     _formatter = msg_formatter;
 }
 
-
+inline void spdlog::logger::flush() {
+    for (auto& sink : _sinks) {
+        sink->flush();
+    }
+}

include/spdlog/logger.h

@@ -107,6 +107,7 @@ public:
     void set_pattern(const std::string&);
     void set_formatter(formatter_ptr);
 
+    void flush();
 
 protected:
     virtual void _log_msg(details::log_msg&);

include/spdlog/sinks/base_sink.h

@@ -58,8 +58,6 @@ public:
         _sink_it(msg);
     }
 
-    virtual void flush() = 0;
-
 protected:
     virtual void _sink_it(const details::log_msg& msg) = 0;
     Mutex _mutex;

include/spdlog/sinks/sink.h

@@ -35,6 +35,7 @@ class sink
 public:
     virtual ~sink() {}
     virtual void log(const details::log_msg& msg) = 0;
+    virtual void flush() = 0;
 };
 }
 }

include/spdlog/sinks/syslog_sink.h

@@ -78,6 +78,8 @@ public:
         ::syslog(syslog_prio_from_level(msg), "%s", msg.formatted.str().c_str());
     }
 
+    virtual void flush() override {
+    }
 
 
 private: