must added

go.mod

@@ -1,3 +1,3 @@
 module git.milar.in/milarin/adverr
 
-go 1.15
+go 1.18

must.go

@@ -0,0 +1,37 @@
+package adverr
+
+// Must panics if err is not nil.
+// It returns value otherwise
+func Must[T any](value T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return value
+}
+
+// Must2 panics if err is not nil.
+// It returns a and b otherwise
+func Must2[A, B any](a A, b B, err error) (A, B) {
+	if err != nil {
+		panic(err)
+	}
+	return a, b
+}
+
+// Must3 panics if err is not nil.
+// It returns a, b and c otherwise
+func Must3[A, B, C any](a A, b B, c C, err error) (A, B, C) {
+	if err != nil {
+		panic(err)
+	}
+	return a, b, c
+}
+
+// Must4 panics if err is not nil.
+// It returns a, b and c otherwise
+func Must4[A, B, C, D any](a A, b B, c C, d D, err error) (A, B, C, D) {
+	if err != nil {
+		panic(err)
+	}
+	return a, b, c, d
+}