add ToLower helper function

openVulkanoCpp/Base/Utils.hpp

@@ -157,6 +157,24 @@ namespace OpenVulkano
 			return str.size() >= suffix.size() && 0 == str.compare(str.size()-suffix.size(), suffix.size(), suffix);
 		}
 
+		static void ToLower(std::string& str)
+		{
+			std::transform(str.begin(), str.end(), str.begin(), [](char c) { std::tolower(c); });
+		}
+
+		static void ToLower(const std::string& str, char* dest)
+		{
+			std::transform(str.begin(), str.end(), dest, [](char c) { std::tolower(c); });
+		}
+
+		static std::string ToLower(const std::string& str)
+		{
+			std::string dest;
+			dest.reserve(str.size());
+			std::transform(str.begin(), str.end(), dest.begin(), [](char c) { std::tolower(c); });
+			return dest;
+		}
+
 		static std::pair<std::string, std::string> SplitAtLastOccurrence(const std::string& str, char splitAt)
 		{
 			size_t pos = str.rfind(splitAt);
@@ -187,11 +205,11 @@ namespace OpenVulkano
 		}
 
 		template<typename T>
-		static Array<char> ReadFile(const T& filePath, bool emptyOnMissing = true,
+		static Array<char> ReadFile(const T& filePath, bool emptyOnMissing = false,
 		                            bool nullTerminateString = false);
 
 		template<size_t N>
-		static Array<char> ReadFile(const char (&filePath)[N], bool emptyOnMissing = true,
+		static Array<char> ReadFile(const char (&filePath)[N], bool emptyOnMissing = false,
 		                            bool nullTerminateString = false)
 		{
 			return ReadFile(std::string(filePath), emptyOnMissing, nullTerminateString);