Option<T extends CandidType> constructor
Option<T extends CandidType> ({
- T? value,
- T? value_type,
- bool isTypeStance = false,
Implementation
Option({this.value, this.value_type, this.isTypeStance=false}) {
if (isTypeStance==true) {
if (value_type==null) {
throw Exception('for an Option as a type-stance is with the value_type-parameter-quirement by the class-rules.');
}
if (value!=null) {
throw Exception('for an Option as a type-stance is with the value-parameter-null-quirement by the class-rules.');
}
} else {
if (value==null && value_type==null) {
throw Exception('an Option needs either a CandidType value, or if the value is null: an Option needs the value_type-parameter set to a CandidType-[in]stance with the isTypeStance=true');
}
}
if (value_type!=null) {
if (value_type!.isTypeStance==false) {
throw Exception('The value_type CandidType must have .isTypeStance == true');
}
}
}