Use find if registry is bigger than 20 in registry::get(std::string_v…

…iew logger_name)

include/spdlog/details/registry-inl.h

@@ -78,21 +78,40 @@ SPDLOG_INLINE void registry::initialize_logger(std::shared_ptr<logger> new_logge
  }
 }
 
-SPDLOG_INLINE std::shared_ptr<logger> registry::get(const std::string &logger_name) {
- std::lock_guard<std::mutex> lock(logger_map_mutex_);
- auto found = loggers_.find(logger_name);
- return found == loggers_.end() ? nullptr : found->second;
+// if the map is small do a sequential search, otherwise use the standard find()
+std::shared_ptr<logger> registry::get(const std::string &logger_name) {
+ if (loggers_.size() <= 20) {
+ for (const auto &[key, val]: loggers_) {
+ if (logger_name == key) {
+ return val;
+ }
+ }
+ return nullptr;
+ }
+ else {
+ auto found = loggers_.find(logger_name);
+ return found == loggers_.end() ? nullptr : found->second;
+ }
 }
 
 #if __cplusplus >= 201703L // C++17
+// if the map is small do a sequential search and avoid creating string for find(logger_name)
+// otherwise use the standard find()
 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;
+ if (loggers_.size() <= 20) {
+ for (const auto &[key, val]: loggers_) {
+ if (logger_name == key) {
+ return val;
+ }
  }
+ return nullptr;
+ }
+ // otherwise use the normal map lookup
+ else {
+ auto found = loggers_.find(std::string(logger_name));
+ return found == loggers_.end() ? nullptr : found->second;
  }
- return nullptr;
 }
 
 SPDLOG_INLINE std::shared_ptr<logger> registry::get(const char *logger_name) {