Dear All, If one passes an object to a method using the 'Ref' keyword then what is the difference with passing it without the ref keyword? Because both yield the same result, that the object has been altered when passing control back to the calling object. Such as this: class Student { public string Name { get; ...
struct Div { int i; int j; }; class A { public: A(); Div& divs; }; In my constructor definition, I have the following A::A() : divs(NULL) {} I get the following error: Error72 error C2354: 'A::divs' : initialization of reference member requires a temporary variable ...
Hello, I was looking at code that implemented the ICloneable interface for one of the classes. The class was as follows: public class TempClass { String[] names; String[] values; } A partial class was created that implemented TempClass public partial class TempClass:ICloneable { public Object Clone() { TempClass clo...
When reference variable can be passed by reference : class Example { public string str="Demo"; public int[] intValues={1,3,4,5}; public static void StrPassing(string someStr) { string otherStr="Changed!"; someStr=otherStr; } public static void NumPassing(i...
I know it wouldn't be exactly equivalent to $this, but is there a way to reference a static class from within itself without using the name of the class itself? ( like super but for itself ) This is just a way to avoid having to refactor all the class references if the class is renamed. Example: class foo { function bar() { static_this...
I've just started learning Python and would like to know if there is a searchable list of Python (3.1) functions available online, like there is for PHP (php.net)? Thanks. ...
Can anyone recommend a good ANSI SQL reference manual? I don't necessary mean a tutorial but a proper reference document to lookup when you need either a basic or more in-depth explanation or example. Currently I am using W3Schools SQL Tutorial and SQL Tutorial which are ok, but I don't find them "deep" enough. Of course, each major ...
I need to add printing capabilities to an app and I have been looking around for information about printing. Logical/physical sizes, dpi, font scaling, etc, lots to digest since I never programmed printing into any app before. Are there any sites that would offer a primer on the topics of page sizes, margins and all the other elements r...
Hi, I have created some C++ classes to model a Solitaire game as a learning exercise. I have classes for the SolitaireGame, a CardStack (one of the 10 piles of cards on the board ) and a Card. My current model states that the SolitaireGame owns a vector of 104 Card objects - which I call the 'shoe'. The SolitaireGame also keeps track ...
I'm looking for a comprehensive and up-to-date reference (preferably in book form) on OpenGL. I'd like to find something that covers OpenGL 3.0 but also need information on OpenGL 2.1 for older hardware (my understanding is that DirectX 10 level hardware is necessary for OpenGL 3 functionality). I'm strongly considering the OpenGL Super...
Here is a simple snippet of C++ code A foo(){ A a; // create a local A object return a; } void bar(const A Why does the argument of function bar have to be a const reference,not just a reference? Edit1: I know that reference is to avoid copying overhead. and const is for read-only. But here I have to make it a const referenc...
I'm having a hard time figuring out how to pass by reference in Java. I currently have a class as follows class Example { ArrayList<Foo> list; Bar hello; Example(ArrayList<foo> list, Bar hello) { this.list = list; this.hello = hello; } } In my main class, I initialize an array list of Foo, and a Bar ob...
What is the size of reference of a class in Java? Is it constant for a particular JVM and OS irrespective of the class for which the reference is made. Class A Class B Class C A a; B b; C c; Is size of a , b and c are same irrespective of the size of A, B and C classes? ...
I have read other posts on SO regarding VS's Add References dialog and how it populates assemblies. However, even after looking in Reference Assemblies folder and using the AssemblyFolders registry key for 32-bit and 64-bit, I am still unable to locate some assemblies, such as Unity/P&P and Office assemblies, when searching for them prog...
Is the 'copy' of an array for a foreach (of php5, in this case) an immediate copy with actual overhead, or merely a lazy copy (copy on write) which only produces overhead if it detects a write manipulation? The alternative, note in several places, is to run foreach over keys($array) -- how can that really be faster? ...
What are the dos and don'ts while using references in Java? ...
I've created a factory assembly that can process any type of transaction (that supports ITransactionType). I can add more transaction types in separate assemblies, all of which will work with the factory without it needing to be recompiled (which is one of the benefits of a factory). There is an actual list of transaction types that ca...
I've been writing java.io code verbosely for far too long, and stumbled onto Apache Commons IO last week. I've used a lot of Commons before, but never looked at IO, and now I feel silly for writing a notable amount of extra code over the years. Is there any good resource for Java libraries that isn't overwhelming, besides maybe reading...
My Visual Studio 2008 project references two (external) assemblies (A+B) both of which happen to be referencing the same third assembly (C). However, assembly A expects assembly C to have a public key which is different from what assembly B expects it to have. Here's an example of the obvious exception: Could not load file or assemb...
One of the aspects of computer science/practical software engineering I am weaker at is actually doing significant work in database systems. That is to say, I can do simple queries on smaller datasets, no problem. However, working with complex queries on large datasets invokes a level of understanding of databases beyond me right now. Fo...