Config: Implement Get and Set

Source/Core/Core/Config/Config.cpp

@@ -22,4 +22,20 @@ bool ConfigLocation::operator<(const ConfigLocation& other) const
 {
   return std::tie(system, section, key) < std::tie(other.system, other.section, other.key);
 }
+
+LayerType GetActiveLayerForConfig(const ConfigLocation& config)
+{
+  for (auto layer : SEARCH_ORDER)
+  {
+    if (!LayerExists(layer))
+      continue;
+
+    if (GetLayer(layer)->Exists(config.system, config.section, config.key))
+      return layer;
+  }
+
+  // If config is not present in any layer, base layer is considered active.
+  return LayerType::Base;
+}
+
 }  // namespace Config

Source/Core/Core/Config/Config.h

@@ -2,8 +2,11 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <string>
 
+#include "Common/Config/Config.h"
 #include "Common/Config/Enums.h"
 
 namespace Config
@@ -18,4 +21,61 @@ struct ConfigLocation
   bool operator!=(const ConfigLocation& other) const;
   bool operator<(const ConfigLocation& other) const;
 };
+
+template <typename T>
+struct ConfigInfo
+{
+  ConfigLocation location;
+  T default_value;
+};
+
+template <typename T>
+T Get(LayerType layer, const ConfigInfo<T>& info)
+{
+  return GetLayer(layer)
+      ->GetOrCreateSection(info.location.system, info.location.section)
+      ->template Get<T>(info.location.key, info.default_value);
+}
+
+template <typename T>
+T Get(const ConfigInfo<T>& info)
+{
+  return Get(LayerType::Meta, info);
+}
+
+template <typename T>
+T GetBase(const ConfigInfo<T>& info)
+{
+  return Get(LayerType::Base, info);
+}
+
+LayerType GetActiveLayerForConfig(const ConfigLocation&);
+
+template <typename T>
+LayerType GetActiveLayerForConfig(const ConfigInfo<T>& info)
+{
+  return GetActiveLayerForConfig(info.location);
+}
+
+template <typename T>
+void Set(LayerType layer, const ConfigInfo<T>& info, const T& value)
+{
+  GetLayer(layer)
+      ->GetOrCreateSection(info.location.system, info.location.section)
+      ->Set(info.location.key, value);
+  InvokeConfigChangedCallbacks();
+}
+
+template <typename T>
+void SetBase(const ConfigInfo<T>& info, const T& value)
+{
+  Set<T>(LayerType::Base, info, value);
+}
+
+template <typename T>
+void SetCurrent(const ConfigInfo<T>& info, const T& value)
+{
+  Set<T>(LayerType::CurrentRun, info, value);
+}
+
 }  // namespace Config