Change KeyCode from an extern variable to a function

inferno/src/inferno/application.cpp

@@ -170,7 +170,7 @@ namespace Inferno {
 		      e.getKey());
 
 		// Stop the main loop on 'Escape' keypress
-		if (e.getKey() == KeyCode["GLFW_KEY_ESCAPE"]) {
+		if (e.getKey() == KeyCode("GLFW_KEY_ESCAPE")) {
 			m_window->setShouldClose(true);
 		}
 

inferno/src/inferno/inputcodes.cpp

@@ -1,10 +1,13 @@
+#include <unordered_map> // std::unordered_map
+
 #include <GLFW/glfw3.h>
 
+#include "inferno/assertions.h"
 #include "inferno/inputcodes.h"
 
 namespace Inferno {
 
-	std::unordered_map<const char*, int> KeyCode ({
+	static std::unordered_map<const char*, int> keys ({
 		{ MAP_KEY(GLFW_KEY_UNKNOWN) },
 		{ MAP_KEY(GLFW_KEY_SPACE) },
 		{ MAP_KEY(GLFW_KEY_APOSTROPHE) },
@@ -128,4 +131,12 @@ namespace Inferno {
 		{ MAP_KEY(GLFW_KEY_MENU) },
 	});
 
+// -----------------------------------------
+
+	int KeyCode(const char* name)
+	{
+		ASSERT(keys.find(name) != keys.end(), "Could not find KeyCode");
+		return keys.at(name);
+	}
+
 }

inferno/src/inferno/inputcodes.h

@@ -3,11 +3,9 @@
 
 #define MAP_KEY(key) #key, key
 
-#include <unordered_map> // std::unordered_map
-
 namespace Inferno {
 
-	extern std::unordered_map<const char*, int> KeyCode;
+	int KeyCode(const char* name);
 
 }