Add validate method to check non zero values

container.go

@@ -33,6 +33,7 @@ var (
 	errReturnCount = errors.New("constructor function must one or two values")
 	errReturnKind  = errors.New("constructor return type must be a pointer")
 	errArgKind     = errors.New("constructor arguments must be pointers")
+	errZeroVal     = errors.New("Object is a zero value")
 
 	_typeOfError = reflect.TypeOf((*error)(nil)).Elem()
 
@@ -157,3 +158,15 @@ func (c *Container) Resolve(objs ...interface{}) (err error) {
 	}
 	return nil
 }
+
+// Validate accepts objects to be validated from constructor and returns an error
+// if any of the provided object is a zero value object
+func Validate(values ...interface{}) error {
+	for _, val := range values {
+		v := reflect.ValueOf(val)
+		if v == reflect.Zero(v.Type()) {
+			return errors.Wrapf(errZeroVal, "%v", v.Type())
+		}
+	}
+	return nil
+}

container_test.go

@@ -564,3 +564,29 @@ func TestMultiObjectRegisterResolve(t *testing.T) {
 	require.NotNil(t, second, "Child2 must have been registered")
 	require.NotNil(t, third, "Child3 must have been registered")
 }
+
+func Test_ZeroValueObjectValidationSuccess(t *testing.T) {
+	t.Parallel()
+	c := New()
+
+	c.Provide(&Parent1{})
+	err := c.Invoke(func(p1 *Parent1) {
+		er := Validate(p1)
+		require.NoError(t, er)
+	})
+	require.Nil(t, err)
+}
+
+func Test_ZeroValueObjectValidationError(t *testing.T) {
+	t.Parallel()
+	c := New()
+
+	var zeroP12 *Parent12
+	err := c.Invoke(func(p12 *Parent12) {
+		er := Validate(p12)
+		require.Error(t, er)
+		require.Contains(t, er.Error(), errZeroVal.Error())
+		zeroP12 = p12
+	})
+	require.Nil(t, err)
+}