The upd_sink and dist_sink files have been modified to address Passed by value warnings. (#3520)

include/spdlog/sinks/dist_sink.h

@@ -24,7 +24,7 @@ class dist_sink : public base_sink<Mutex> {
 public:
     dist_sink() = default;
     explicit dist_sink(std::vector<std::shared_ptr<sink>> sinks)
-        : sinks_(sinks) {}
+        : sinks_(std::move(sinks)) {}
 
     dist_sink(const dist_sink &) = delete;
     dist_sink &operator=(const dist_sink &) = delete;

include/spdlog/sinks/udp_sink.h

@@ -36,7 +36,7 @@ template <typename Mutex>
 class udp_sink : public spdlog::sinks::base_sink<Mutex> {
 public:
     // host can be hostname or ip address
-    explicit udp_sink(udp_sink_config sink_config)
+    explicit udp_sink(const udp_sink_config& sink_config)
         : client_{sink_config.server_host, sink_config.server_port} {}
 
     ~udp_sink() override = default;