diff --git a/gcml.h b/gcml.h
index dbf9ec6..3d10af8 100644
--- a/gcml.h
+++ b/gcml.h
@@ -426,6 +426,29 @@
 
 
 
+
+#define MAX_OF(...)  MAX_OF_IMPL(__VA_ARGS__, MAX_OF_RSEQ_N())
+#define MAX_OF_IMPL(...)  MAX_OF_ARG_N(__VA_ARGS__)
+#define MAX_OF_ARG_N(_1, _2, _3, _4, _5, N, ...) N
+#define MAX_OF_RSEQ_N() 5,4,3,2,1,0
+
+#define MIN_OF(...)  MIN_OF_IMPL(__VA_ARGS__, MIN_OF_RSEQ_N())
+#define MIN_OF_IMPL(...)  MIN_OF_ARG_N(__VA_ARGS__)
+#define MIN_OF_ARG_N(_1, _2, _3, _4, _5, N, ...) N
+#define MIN_OF_RSEQ_N() 5,4,3,2,1,0
+
+
+#define ZERO_STRUCT(s) memset(&(s), 0, sizeof(s))
+
+
+#define PRINT_VAR(var) LOG_INFO(#var " = %d", var)
+
+
+
+
+
+
+
 #endif // GCML_H