mc root source folder cleanup

mc/util/must.go

@@ -0,0 +1,40 @@
+package util
+
+import "fmt"
+
+func MustOk[T any](v T, ok bool) T {
+	if !ok {
+		panic("not ok")
+	}
+	return v
+}
+
+func MustT[T any](v T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+func Must(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func AssertTypeError[T any](v any) (T, error) {
+	var zero T
+	r, ok := v.(T)
+	if !ok {
+		return zero, fmt.Errorf("type assertion failed: %T cannot be asserted to %T", v, zero)
+	}
+	return r, nil
+}
+
+func MapGetError[K comparable, V any, M map[K]V](m M, k K) (V, error) {
+	v, ok := m[k]
+	if !ok {
+		return v, fmt.Errorf("key %v not found", k)
+	}
+	return v, nil
+}