[Util] Add a FastString helper class.

H2Codez/util/FastString.h

@@ -0,0 +1,56 @@
+#pragma once
+#include <functional>
+#include <variant>
+#include <string>
+
+class FastString
+{
+public:
+	FastString() {
+		contents = "";
+	}
+	/// <summary>
+	/// Construct the string with a const string, it is your responsibility to ensure this string remains valid
+	/// </summary>
+	/// <param name="string"></param>
+	FastString(const char* string) {
+		contents = string;
+	}
+
+	FastString(const std::string& string) {
+		contents = string;
+	}
+
+	inline const char* get() const {
+		return std::holds_alternative<std::string>(contents) ?
+			std::get<std::string>(contents).c_str() :
+			std::get<const char*>(contents);
+	}
+
+	bool operator<(const FastString& other) const  {
+		if (contents.index() == other.contents.index() && contents.index() == 1) {
+			return std::get<std::string>(contents) < std::get<std::string>(other.contents);
+		}
+
+		return strcmp(get(), other.get()) < 0;
+	}
+
+	bool operator>(const FastString& other) const {
+		if (contents.index() == other.contents.index() && contents.index() == 1) {
+			return std::get<std::string>(contents) > std::get<std::string>(other.contents);
+		}
+
+		return strcmp(get(), other.get()) > 0;
+	}
+
+	bool operator==(const FastString& other) const {
+		if (contents.index() == other.contents.index() && contents.index() == 1) {
+			return std::get<std::string>(contents) == std::get<std::string>(other.contents);
+		}
+
+		return strcmp(get(), other.get()) == 0;
+	}
+
+private:
+	std::variant<const char*, std::string> contents;
+};