Disabled external gits

cs453-ca/CS453-2021-project/reference/macros.h

@@ -0,0 +1,36 @@
+#include <stdbool.h>
+
+/** Define a proposition as likely true.
+ * @param prop Proposition
+**/
+#undef likely
+#ifdef __GNUC__
+    #define likely(prop) \
+        __builtin_expect((prop) ? true : false, true /* likely */)
+#else
+    #define likely(prop) \
+        (prop)
+#endif
+
+/** Define a proposition as likely false.
+ * @param prop Proposition
+**/
+#undef unlikely
+#ifdef __GNUC__
+    #define unlikely(prop) \
+        __builtin_expect((prop) ? true : false, false /* unlikely */)
+#else
+    #define unlikely(prop) \
+        (prop)
+#endif
+
+/** Define a variable as unused.
+**/
+#undef unused
+#ifdef __GNUC__
+    #define unused(variable) \
+        variable __attribute__((unused))
+#else
+    #define unused(variable)
+    #warning This compiler has no support for GCC attributes
+#endif