muonsoft / validation

func ExampleNewCustomStringConstraint() {

	validate := func(s string) bool {

		return s == "valid"

	}

	constraint := validation.NewCustomStringConstraint(

		validate,

		"ExampleConstraint", // constraint name

		"exampleCode",       // violation code

		"Unexpected value.", // violation message template

	)

	s := "foo"

	err := validator.ValidateString(&s, constraint)

	fmt.Println(err)