TypeScript 2.1 had a breaking changes regarding Extending built-ins like Error. From the TypeScript breaking changes documentation class FooError extends Error { constructor(msg: string) { super(msg); // Set the prototype explicitly. Object.setPrototypeOf(this, FooError.prototype); } sayHello() { return “hello ” + this.message; } } Then you can use: let error = new FooError(“Something really bad went … Read more
There no concept of abstract in Swift (like Objective-C) but you can do this : class BaseClass { func abstractFunction() { preconditionFailure(“This method must be overridden”) } } class SubClass : BaseClass { override func abstractFunction() { // Override } }
In addition to what Nejinx said, you must not directly call your start(), always call launch(), because it sets up the JavaFX environment, including creation of stage and calls start() passing the stage as an parameter to it. The docs has a note specially stating this NOTE: This method is called on the JavaFX Application … Read more
There is nothing that exactly matches that. There are two concepts that come to mind. Structural composition struct Person { age: u8, } struct Child { person: Person, has_toy: bool, } impl Person { fn new(age: u8) -> Self { Person { age: age } } fn age(&self) -> u8 { self.age } } impl … Read more
I was spinning my head around how to do the same thing and i found out it’s actually not that hard. Basically just subclass the ostream and the streambuf objects, and construct the ostream with itself as the buffer. the virtual overflow() from std::streambuf will be called for every character sent to the stream. To … Read more
Why am I not allowed to just give it another value? You are definitely allowed to give an inherited property a different value. You can do it if you initialize the property in a constructor that takes that initial value, and pass a different value from the derived class: class Jedi { // I made … Read more
There are no abstract classes in Swift (just like Objective-C). Your best bet is going to be to use a Protocol, which is like a Java Interface. With Swift 2.0, you can then add method implementations and calculated property implementations using protocol extensions. Your only restrictions are that you can’t provide member variables or constants … Read more
Looks like @mixin and @include are not needed for a simple case like this. One can just do: .myclass { font-weight: bold; font-size: 90px; } .myotherclass { @extend .myclass; color: #000000; }
The truth is: data classes do not play too well with inheritance. We are considering prohibiting or severely restricting inheritance of data classes. For example, it’s known that there’s no way to implement equals() correctly in a hierarchy on non-abstract classes. So, all I can offer: don’t use inheritance with data classes.
Since Maven 3.5.0 you can use the ${revision} placeholder for that. The use is documented here: Maven CI Friendly Versions. In short the parent pom looks like this (quoted from the Apache documentation): <project> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.apache</groupId> <artifactId>apache</artifactId> <version>18</version> </parent> <groupId>org.apache.maven.ci</groupId> <artifactId>ci-parent</artifactId> <name>First CI Friendly</name> <version>${revision}</version> … <properties> <revision>1.0.0-SNAPSHOT</revision> </properties> <modules> <module>child1</module> .. </modules> </project> … Read more