wrapper

问题 When I should go for wrapper class over primitive types? Or On what circumstance I should choose between wrapper / Primitive types? 回答1: Others have mentioned that certain constructs such as Collections require objects and that objects have more overhead than their primitive counterparts (memory & boxing). Another consideration is: It can be handy to initialize Objects to null or send null parameters into a method/constructor to indicate state or function. This can't be done with primitives.

问题 I\'m looking to develop a set of C APIs that will wrap around our existing C++ APIs to access our core logic (written in object-oriented C++). This will essentially be a glue API that allows our C++ logic to be usable by other languages. What are some good tutorials, books, or best-practices that introduce the concepts involved in wrapping C around object-oriented C++? 回答1: This is not too hard to do by hand, but will depend on the size of your interface. The cases where I've done it were to

问题 As of Java 1.5, you can pretty much interchange Integer with int in many situations. However, I found a potential defect in my code that surprised me a bit. The following code: Integer cdiCt = ...; Integer cdsCt = ...; ... if (cdiCt != null && cdsCt != null && cdiCt != cdsCt) mismatch = true; appeared to be incorrectly setting mismatch when the values were equal, although I can\'t determine under what circumstances. I set a breakpoint in Eclipse and saw that the Integer values were both 137,

问题 What is a wrapper class? How are such classes useful? 回答1: In general, a wrapper class is any class which "wraps" or "encapsulates" the functionality of another class or component. These are useful by providing a level of abstraction from the implementation of the underlying class or component; for example, wrapper classes that wrap COM components can manage the process of invoking the COM component without bothering the calling code with it. They can also simplify the use of the underlying

问题 I have a simple jQuery script in a WordPress plugin that is using a jQuery wrapper like this: $(document).ready(function(){ // jQuery code is in here }); I am calling this script from within the WordPress Dashboard and am loading it AFTER the jQuery framework has loaded. When I check the page in Firebug I constantly keep receiving the error message: TypeError: $ is not a function $(document).ready(function(){ Should I maybe wrap the script in this function: (function($){ // jQuery code is in