extend

问题 Haskell newbie here. I wrote an evaluator for a minimal assembly-like language. Now, I want to extend that language to support some syntactic sugar which, I will then compile back to use only the primitive operators. The ideia is that I do not want to touch the evaluator module again. In the OO way of doing things, I think, one could extend the original module so to support the syntactic sugar operators, providing here the translation rules. Other than that, I can only think of rewriting the

问题 I know I can @extend .foo:hover, but is there a way to @extend the .foobar base/default properties without also extending the definitions for pseudo-classes like :hover, :active, etc? For example , how would I change the following such that .foobar extends only .foo's default state? .foo { & { color:blue; } &:hover { background-color: black; } } .foobar { @extend .foo; &:hover { //As is, I have to override. Any better way? background-color: transparent; } } (If there is no way to do this with

问题 OK I think I get Difference between jQuery.extend and jQuery.fn.extend? in that the general extend can extend any object, and that fn.extend is for plugin functions that can be invoked straight off the jquery object with some internal jquery voodoo. So it appears one would invoke them differently. If you use general extend to extend object obj by adding function y, then the method would attach to that object, obj.y() but if you use fn.extend then they are attach straight to the jquery object

问题 I'd like to extend Application in my Android app. I've done this such that I've created an extended Application object called MyApplication and added it to the manifest. I'd now like to add some getters and setters to hold some information. It looks like I'll need to pass the application Context to any classes which do not contain a Context. For example, say I create a class called MyObject (in its own java file): public class MyObject { public void doStuff() { // do stuff } } How might I

问题 I am struggling with deep copies of objects in nodeJS. my own extend is crap. underscore's extend is flat. there are rather simple extend variants here on stackexchange, but none are even close to jQuery.extend(true, {}, obj, obj, obj) .. (most are actually terrible and screw up the benefits of asnyc code.) hence, my question: is there a good deep copy for NodeJS? Has anybody ported jQuery's ? 回答1: You want jQuery's, so just use it: function extend() { var options, name, src, copy,

问题 I'm wondering whether in the situation where I'm extending a class that has already 'use' keyword above it to use specific namespace - do I need to add another 'use' above the inheriting class to use the same namespace? Situation like this: namespace Core; use System\Plugin; class Front extends Application { } and now in the Controller, which is called directly without the namespace (using full path): use System\Plugin; class PageController extends Front { } or would it work without 'use' as

问题 I'm having issues appending data to a list which is already in a list format. I have a program which will export results objects during a simulation loop. The data itself is stored as a list of matrices. My idea is to store those lists in a list, and then save this list of lists as an R object for later analysis, however I'm having some issues achieving this correctly. I'll show what I've done with small abstract example just using values instead of the matrix data from my simulation: Say I

问题 Need help with following situation: Users can generate their own data structures which are stored as JAXB-ready XSD sources like below: <xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="Group" type="Group"/> <xs:element name="Parameter" type="Parameter"/> <xs:complexType name="Group"> <xs:sequence> <xs:element name="caption" type="xs:string" minOccurs="0"/> <xs:element name="parameters" type="Parameter" nillable="true" minOccurs="0" maxOccurs="unbounded"/

问题 When attempting to add my own behavior to the Object class, I get undesired effects that don't occur when mixing the module into a user-defined class. module Entity def some_instance_method puts 'foo' end def self.secret_class_method puts 'secret' end module ClassMethods def some_class_method puts 'bar' end end def self.included( other_mod ) other_mod.extend( ClassMethods ) end end Now, I create class Bob such that it includes Entity . class Bob; include Entity; end; This yields the desired

问题 First, the question is very similar to downcasting shared pointer to derived class with additional functionality is, where there are good answers. But I'd like to have explanation on why this is valid (or not) and when not using shared pointers. So : class Base { /* ... */ }; class Derived : public Base { public: void additionnalFunc(int i){ /* access Base members */ } }; int main(){ Base b; Derived* d = (Derived*) &b; // or static_cast ? d->additionnalFunc(3); // works ok. } This works as