UE4 Key global constants

ConfigCacheIni.cpp

/**
 * Structure to define all the layers of the config system. Layers can be expanded by expansion files (NoRedist, etc), or by ini platform parents
 * (coming soon from another branch)
 */
struct FConfigLayer
{
	// Used by the editor to display in the ini-editor
	const TCHAR* EditorName;
	// Path to the ini file (with variables)
	const TCHAR* Path;
	// Path to the platform extension version
	const TCHAR* PlatformExtensionPath;
	// Special flag
	EConfigLayerFlags Flag;

} GConfigLayers[] =
{
	/**************************************************
	**** CRITICAL NOTES
	**** If you change this array, you need to also change EnumerateConfigFileLocations() in ConfigHierarchy.cs!!!
	**** And maybe UObject::GetDefaultConfigFilename(), UObject::GetGlobalUserConfigFilename()
	**************************************************/

	// Engine/Base.ini
	{ TEXT("AbsoluteBase"),				TEXT("{ENGINE}Base.ini"), TEXT(""), EConfigLayerFlags::Required },
	
	// Engine/Base*.ini
	{ TEXT("Base"),						TEXT("{ENGINE}{ED}{EF}Base{TYPE}.ini") },
	// Engine/Platform/BasePlatform*.ini
	{ TEXT("BasePlatform"),				TEXT("{ENGINE}{ED}{PLATFORM}/{EF}Base{PLATFORM}{TYPE}.ini"), TEXT("{EXTENGINE}/{ED}{EF}Base{PLATFORM}{TYPE}.ini"),  },
	// Project/Default*.ini
	{ TEXT("ProjectDefault"),			TEXT("{PROJECT}{ED}{EF}Default{TYPE}.ini"), TEXT(""), EConfigLayerFlags::AllowCommandLineOverride | EConfigLayerFlags::GenerateCacheKey },
	// Engine/Platform/Platform*.ini
	{ TEXT("EnginePlatform"),			TEXT("{ENGINE}{ED}{PLATFORM}/{EF}{PLATFORM}{TYPE}.ini"), TEXT("{EXTENGINE}/{ED}{EF}{PLATFORM}{TYPE}.ini") },
	// Project/Platform/Platform*.ini
	{ TEXT("ProjectPlatform"),			TEXT("{PROJECT}{ED}{PLATFORM}/{EF}{PLATFORM}{TYPE}.ini"), TEXT("{EXTPROJECT}/{ED}{EF}{PLATFORM}{TYPE}.ini") },
	
	// UserSettings/.../User*.ini
	{ TEXT("UserSettingsDir"),			TEXT("{USERSETTINGS}Unreal Engine/Engine/Config/User{TYPE}.ini") },
	// UserDir/.../User*.ini
	{ TEXT("UserDir"),					TEXT("{USER}Unreal Engine/Engine/Config/User{TYPE}.ini") },
	// Project/User*.ini
	{ TEXT("GameDirUser"),				TEXT("{PROJECT}User{TYPE}.ini"), TEXT(""), EConfigLayerFlags::GenerateCacheKey },
};

{ENGINE} - EngineConfigDir = L"../../../Engine/Config/"
{TYPE} - L"Scalability"
{USERSETTINGS} - FPlatformProcess::UserSettingsDir() - L"C:/Users/USERNAME/AppData/Local/"
{USER} - FPlatformProcess::UserDir() - L"C:/Users/USERNAME/Documents/"