call method

@override String? call(T? value)

Implementation

@override
String? call(T? value) {
  var fieldvalue = getFieldValue();
  if (value is T && value == fieldvalue) {
    return null;
  } else {
    var builder = errorMessageBuilder;
    if (builder != null) return builder(fieldName);
    return resolveErrorMessage("Value should match '$fieldName'.");
  }
}