diff --git a/src/util.mojo b/src/util.mojo
new file mode 100644
index 0000000..9bd7a3f
--- /dev/null
+++ b/src/util.mojo
@@ -0,0 +1,5 @@
+# error checking blas_error_if(condition, __function_name__, "parameter_name", parameter)
+fn blas_error_if[T: Stringable ](cond: Bool, caller: String, param: String, val: T) raises:
+    if(cond) :
+        raise Error(caller, " Error: ", param, " = ", String(val))
+