reification | 易学教程

Download Wikidata single entity - truthy

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问题 I would like to download Wikidata for a single entity. I know I can achieve using the URL, for example: https://www.wikidata.org/wiki/Special:EntityData/Q42.rdf Will give me Wikidata for Douglas Adams in RDF format. But this data is fully, meaning complete with meta-data such as qualifiers and references. I am interested in primary data only. Actually I am working on RDF Reification, and for that I need some sample non-RDF data which I can test my program on (like truthy Wikidata). I do not

Capture method missing in Javascript and do some logic?

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问题 In Ruby, you can capture a call to a method which is missing and define it on the fly. What I wanna accomplish in JavaScript is to have an object with no methods. I want a missing method to be translated into a call to emit(): app.isReady() -> app.emit("isReady") soldier.kills() -> soldier.emit("kills") I think it's better to capture the missing method error and run emit(methodName) rather than defining all methods (from a fixed list) at runtime. That way we don't have performance overhead if

What is reification?

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I know that Java implements parametric polymorphism (Generics) with erasure. I understand what erasure is. I know that C# implements parametric polymorphism with reification. I know that can make you write public void dosomething(List<String> input) {} public void dosomething(List<Int> input) {} or that you can know at runtime what the type parameter of some parameterised type is, but I don't understand what it is . What is a reified type? What is a reified value? What happens when a type/value is reified? Theodoros Chatzigiannakis Reification is the process of taking an abstract thing and

Why should I care that Java doesn't have reified generics?

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This came up as a question I asked in an interview recently as something the candidate wished to see added to the Java language. It's commonly-identified as a pain that Java doesn't have reified generics but, when pushed, the candidate couldn't actually tell me the sort of things that he could have achieved were they there. Obviously because raw types are allowable in Java (and unsafe checks), it is possible to subvert generics and end up with a List<Integer> that (for example) actually contains String s. This clearly could be rendered impossible were type information reified; but there must

What is reification?

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问题 I know that Java implements parametric polymorphism (Generics) with erasure. I understand what erasure is. I know that C# implements parametric polymorphism with reification. I know that can make you write public void dosomething(List<String> input) {} public void dosomething(List<Int> input) {} or that you can know at runtime what the type parameter of some parameterised type is, but I don\'t understand what it is . What is a reified type? What is a reified value? What happens when a type

Why should I care that Java doesn't have reified generics?

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问题 This came up as a question I asked in an interview recently as something the candidate wished to see added to the Java language. It\'s commonly-identified as a pain that Java doesn\'t have reified generics but, when pushed, the candidate couldn\'t actually tell me the sort of things that he could have achieved were they there. Obviously because raw types are allowable in Java (and unsafe checks), it is possible to subvert generics and end up with a List<Integer> that (for example) actually

What are Reified Generics? How do they solve Type Erasure problems and why can't they be added without major changes?

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问题 I\'ve read Neal Gafter\'s blog on the subject and am still unclear on a number of points. Why is it not possible to create implementations of the Collections API that preserve type information given the current state of Java, the JVM and existing collections API? Couldn\'t these replace the existing implementations in a future version of Java in a way where backwards compatibility is preserved? As an example: List<T> list = REIList<T>(T.Class); Where REIList is something like this: public

Scala: What is a TypeTag and how do I use it?

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问题 All I know about TypeTags is that they somehow replaced Manifests. Information on the Internet is scarce and doesn\'t provide me with a good sense of the subject. So I\'d be happy if someone shared a link to some useful materials on TypeTags including examples and popular use-cases. Detailed answers and explanations are also welcome. 回答1: A TypeTag solves the problem that Scala's types are erased at runtime (type erasure). If we wanna do class Foo class Bar extends Foo def meth[A](xs: List[A]