Refactored error handling

Now uses base error class which has an abstract function for overiding how it is displayed to the console.

common/Console.h

@@ -0,0 +1,60 @@
+#pragma once
+
+#define NOMINMAX
+#include <Windows.h>
+
+#include <iostream>
+#include <string>
+
+namespace LX
+{
+	enum class Color
+	{
+		BLACK = 0,
+		BLUE = 1,
+		GREEN = 2,
+		AQUA = 3,
+		RED = 4,
+		PURPLE = 5,
+		YELLOW = 6,
+		LIGHT_GRAY = 7,
+		LIGHT_BLUE = 9,
+		LIGHT_GREEN = 10,
+		LIGHT_AQUA = 11,
+		LIGHT_RED = 12,
+		LIGHT_PURPLE = 13,
+		LIGHT_YELLOW = 14,
+		WHITE = 15
+	};
+
+	inline void PrintStringAsColor(const std::string& str, Color c)
+	{
+		// Gets a handle to the console //
+		static HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
+
+		// Sets the color of the console to the desired color //
+		SetConsoleTextAttribute(hConsole, (WORD)c);
+
+		// Outputs the text //
+		std::cout << str;
+
+		// Resets the color //
+		SetConsoleTextAttribute(hConsole, (WORD)Color::LIGHT_GRAY);
+	}
+
+	// Util function for getting a line of the source at a given index (used for errors) //
+	inline std::string GetLineAtIndexOf(const std::string src, const std::streamsize index)
+	{
+		// Finds the start of the line //
+		size_t start = src.rfind('\n', index);
+		if (start == std::string::npos) { start = 0; } // None means first line
+		else { start = start + 1; } // Skips new line char
+
+		// Finds the end of the line //
+		size_t end = src.find('\n', index);
+		if (end == std::string::npos) { end = src.size(); } // None means last line
+
+		// Returns the string between start and end //
+		return src.substr(start, end - start);
+	}
+}

common/Error.h

@@ -0,0 +1,24 @@
+#pragma once
+
+namespace LX
+{
+	// Base error class for all LX thrown errors //
+	// Holds nothing apart from the v-table //
+	struct RuntimeError
+	{
+		// Prints the error to the console //
+		// Include Common/Console.h for printing util functions //
+		virtual void PrintToConsole() const = 0;
+
+		// Returns a C-String of the type that was thrown //
+		virtual const char* ErrorType() const = 0;
+	};
+}
+
+// Helper macro to autogenerate a basic error type in a .h file //
+// Still requires function definitions in a .cpp file //
+#define CREATE_EMPTY_LX_ERROR_TYPE(name)\
+struct name : public LX::RuntimeError{ GENERATE_LX_ERROR_REQUIRED_FUNCTION_DECLARATIONS };
+
+// Helper macro to autogenerate function declarations of functions required by LX::RuntimeError //
+#define GENERATE_LX_ERROR_REQUIRED_FUNCTION_DECLARATIONS void PrintToConsole() const; const char* ErrorType() const;

common/ThrowIf.h

@@ -0,0 +1,31 @@
+#pragma once
+
+// Type traits is included for std::is_base_of_v //
+#include <type_traits>
+
+namespace LX
+{
+	// Foward declares LX::RuntimeError so it can be used to see if a class derives from //
+	struct RuntimeError;
+
+	// Util function to throw an error if the condition is met //
+	// Given error type must derive from LX::RuntimeError //
+	template<typename Error, typename... Args>
+	inline void ThrowIf(const bool condition, Args&&... args)
+	{
+		// Checks that the error type will be caught by the error checker //
+		static_assert
+		(
+			std::is_base_of_v<LX::RuntimeError, Error>,
+			"Must throw a type that derives from LX::RuntimeError"
+		);
+
+		// Checks if the condition is met and micro-optimises that errors will not be thrown //
+		if (condition) [[unlikely]]
+		{
+			// Throws a COPY of the error and not itself //
+			// How C++ works, no way around it //
+			throw Error(std::forward<Args>(args)...);
+		}
+	}
+}