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Questions tagged [subtype]

198 questions
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Error: Invalid override in ==

The following error: ERROR: Invalid override. The type of Bar.== ((Bar) → bool) is not a subtype of Foo.== ((Foo) → bool). Occurs in line 10 of the following code (v1.15.0): 1 class Foo { 2 int foo; 3 Foo(this.foo); 4 bool operator…
jfp
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How can I deal with sub type in Java?

Hi this is what I've got in the Modula 2 code, TYPE TypeA = TypeB; PROCEDURE Extend(Var: TypeA): TypeA; BEGIN RETURN Varrr: TypeA; END Extend; So I already have a type B, now I need to make it a new type called type A, so all type A is type…
Anda Zhao
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Why would somebody cast instead of returning a subtype

When overriding an inherited method, is there any reason to not declare the type a sub-type of of its original type? (Animal instead of Bunny see below) Here is an example with bunnies. public class Junk2 { public static abstract class Animal…
Derrops
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VHDL: How to assign "integer range 0 to 99" as a new type name like typedef is used in C++

This is what I am trying to do in VHDL: type score is integer range 0 to 99; type speed is integer range 0 to 99; But I think I have fundamentally misunderstood how "type" works in VHDL as the tool is generating error. It says near "integer":…
quantum231
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How to define a subtype in SQL?

I'm trying to define a subtype but I have no idea how, I've googled it but I didn't find anything concrete. What I'm trying to do is build a netflix-like database which has movies and series. So I have my "supertable" called "images" (didn't know…
Bram-N
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calling method with list of subtype without casting

The Call List subList1 = new List(); List subList2 = new List(); FuzzyCompareCollection(subList1,subList2); //Compile Error How i could do…
FreeG
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Ada "Subtype mark required"

I was given a project at uni where I need to write an ADA package of a graph. The points of the graph are stored in an array, the edges are stored in a matrix.(In the matrix if there is an edge between two points the number at that index is the…
Dorrektor125
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Scala Inheritance of Type Constructor

Right now, I am trying to implement a variant of a Linked List with the following code, but I am having trouble with it. Basically, I am trying to create different type of nodes that will connect with each other by the next method. Thus, I have two…
mtber75
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Is the use of a type where its range-restricted subtype is expected considered correct in Ada?

According to slide 28 of https://github.com/AdaCoreU/Courses/blob/master/lectures/03_Programming_in_the_Large/02_Type_Safety/slides/Strong_Typing.ppt?raw=true the below code is correct, because "T is a subtype of Integer. Therefore, V1 and V2 are of…
dzrubtdp
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Applying properties of a base type to a subtype in JavaScript

I would like to include the properties and initialization logic from a "base" type into a "sub" type in JavaScript. Is the following idiomatic? function Base(arg1) { this.foo = arg1.foo; } function Sub(arg1) { //Initialize using the base…
Ben Aston
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Swift - Character is not a subtype of string

myText = "word 1 / word 2" var testVar = split(myText, { $0 == "/"}, maxSplit: Int.max, allowEmptySlices: false) This code works but it takes empty space "word 1 " when I use testVar[0] when I write empty spaces var testVar = split(myText, { $0…
Bogdan Bogdanov
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Oracle SQL classify Subtype

CREATE TABLE Customer ( CustomerID NUMBER NOT NULL, AccountID NUMBER(10) NOT NULL, CustomerType VARCHAR(10) NOT NULL, CustomerStatus VARCHAR(10) NOT NULL, CONSTRAINT customer_pk PRIMARY KEY (CustomerID), CONSTRAINT check_customer_status…
pooch
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array type required in indexed component ADA

Alright, so i'm writing a program that's designed to compare 7 digit inputs to a known set of seven digit inputs and find the distances between them. Everything compiles fine except for the fact that I'm getting an error that states that "array type…
Iccirrus
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Is it possible to create an error and assign it to an error subtype variable in VBScript?

Theoretically, if VarType(foo) returns 10 or vbError, it means that foo is an error. Am I wrong? So how do I force this to happen? Is it even possible to force foo to hold an error? If it's not, then I don't understand why Error is a variable…
Enorma
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vhdl convert subtype to type for active hdl

I have a pakcgae in which I declare a bunch of subtypes and types. In Active HDL, there seems to be a problem whenever I try to make a port out of a subtype, so I'm wondering if there is a way to convert them to types instead. The following would be…
Ryan Thorne
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