feature: adds string view overloads for logger accessor (#3023)

Co-authored-by: Ben Leadbetter <ben.leadbetter@native-instruments.com>

include/spdlog/details/registry-inl.h

@@ -84,6 +84,22 @@ SPDLOG_INLINE std::shared_ptr<logger> registry::get(const std::string &logger_na
     return found == loggers_.end() ? nullptr : found->second;
 }
 
+#if __cplusplus >= 201703L  // C++17
+SPDLOG_INLINE std::shared_ptr<logger> registry::get(std::string_view logger_name) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (const auto &[key, val] : loggers_) {
+        if (key == logger_name) {
+            return val;
+        }
+    }
+    return nullptr;
+}
+
+SPDLOG_INLINE std::shared_ptr<logger> registry::get(const char *logger_name) {
+    return get(std::string_view(logger_name));
+}
+#endif
+
 SPDLOG_INLINE std::shared_ptr<logger> registry::default_logger() {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     return default_logger_;

include/spdlog/details/registry.h

@@ -18,6 +18,10 @@
 #include <string>
 #include <unordered_map>
 
+#if __cplusplus >= 201703L  // C++17
+    #include <string_view>
+#endif
+
 namespace spdlog {
 class logger;
 
@@ -33,6 +37,10 @@ public:
     void register_logger(std::shared_ptr<logger> new_logger);
     void initialize_logger(std::shared_ptr<logger> new_logger);
     std::shared_ptr<logger> get(const std::string &logger_name);
+#if __cplusplus >= 201703L  // C++17
+    std::shared_ptr<logger> get(std::string_view logger_name);
+    std::shared_ptr<logger> get(const char *logger_name);
+#endif
     std::shared_ptr<logger> default_logger();
 
     // Return raw ptr to the default logger.