yuzu_cmd: config: Pass a reference in

Also adds documentation for the ReadSetting function.

Address review comments.

Co-authored-by: Mai M. <mathew1800@gmail.com>

src/yuzu_cmd/config.cpp

@@ -242,19 +242,19 @@ static const std::array<int, 8> keyboard_mods{
 };
 
 template <>
-void Config::ReadSetting(const std::string& group, Settings::BasicSetting<float> setting) {
+void Config::ReadSetting(const std::string& group, Settings::BasicSetting<float>& setting) {
     setting = sdl2_config->GetReal(group, setting.GetLabel(), setting.GetDefault());
 }
 template <>
-void Config::ReadSetting(const std::string& group, Settings::BasicSetting<std::string> setting) {
+void Config::ReadSetting(const std::string& group, Settings::BasicSetting<std::string>& setting) {
     setting = sdl2_config->Get(group, setting.GetLabel(), setting.GetDefault());
 }
 template <>
-void Config::ReadSetting(const std::string& group, Settings::BasicSetting<bool> setting) {
+void Config::ReadSetting(const std::string& group, Settings::BasicSetting<bool>& setting) {
     setting = sdl2_config->GetBoolean(group, setting.GetLabel(), setting.GetDefault());
 }
 template <typename Type>
-void Config::ReadSetting(const std::string& group, Settings::BasicSetting<Type> setting) {
+void Config::ReadSetting(const std::string& group, Settings::BasicSetting<Type>& setting) {
     setting = static_cast<Type>(sdl2_config->GetInteger(group, setting.GetLabel(),
                                                         static_cast<long>(setting.GetDefault())));
 }

src/yuzu_cmd/config.h

@@ -26,6 +26,12 @@ public:
     void Reload();
 
 private:
+    /**
+     * Applies a value read from the sdl2_config to a BasicSetting.
+     *
+     * @param group The name of the INI group
+     * @param setting The yuzu setting to modify
+     */
     template <typename Type>
-    void ReadSetting(const std::string& group, Settings::BasicSetting<Type> setting);
+    void ReadSetting(const std::string& group, Settings::BasicSetting<Type>& setting);
 };