I am trying to pass a member function within a class to a function that takes a member function class pointer. The problem I am having is that I am not sure how to properly do this within the class using the this pointer. Does anyone have suggestions? Here is a copy of the class that is passing the member function: class testMenu : p...
Is there any way to redefine a class or some of it's methods without using typical inheritance ex: class third_party_library { function buggy_function() { return 'bad result'; } function other_functions(){ return 'blah'; } } what can I do to replace the buggy_function? Obviously this is what i would lik...
For a new project that I'm doing in PHP I've created an SQLMethods class to connect to the database and perform queries. Tonight was the first night that I actually got to test it (I wrote it a week or so ago and forgot about it) and an unexpected error occured: When it was calling my ExecuteQuery() function, it wouldn't use the database...
I noticed some code of a colleague today that initialized class variables in the initialization. However it was causing a warning, he says because of the order they are in. My question is why is it better to do variable initialization where it currently is and not within the curly brackets? DiagramScene::DiagramScene( int slideNo, QRe...
In .NET, if a class contains a member that is a class object, should that member be exposed as a property or with a method? ...
I have seen member functions programed both inside of the class they belong to and outside of the class with a function prototype inside of the class. I have only ever programmed using the first method, but was wondering if it is better practice to use the other or just personal preference? ...
How do I stop a function/procedure in a superclass from been overridden in a subclass in Delphi (2007)? I want to mark it so it can not be altered, I believe there is a final keyword but can not for the life of me find the documentation for it, so I am not 100% sure that's what I need. ...
Is it possible, in Java, to enforce that a class have a specific set of subclasses and no others? For example: public abstract class A {} public final class B extends A {} public final class C extends A {} public final class D extends A {} Can I somehow enforce that no other subclasses of A can ever be created? ...
I wish to implement a 2d bit map class in Python. The class would have the following requirements: Allow the creating of arbitrarily sized 2d bitmaps. i.e. to create an 8 x 8 bitmap (8 bytes), something like: bitmap = Bitmap(8,8) provide an API to access the bits in this 2d map as boolean or even integer values, i.e.: if bitmap[1, 2...
What's the best way of accessing the control in the enclosing class from the nested class? Say if I have a dropdown in a form and I have another nested class inside of this class . Now what's the best way to access this dropdownlist from the nested class? ...
I have a large collection of static 'Utility' classes that contain very generic static methods. For example, I have a CollectionUtility class that has useful methods like: public static void RemoveDuplicates(ICollection collection)... etc With C# 3.0 I've been converting these to extension methods. Now, I've heard some talk that in an...
I couldn't really find this in Rails documentation but it seems like 'mattr_accessor' is the Module corollary for 'attr_accessor' (getter & setter) in a normal Ruby class. Eg. in a class class User attr_accessor :name def set_fullname @name = "#{self.first_name} #{self.last_name}" end end Eg. in a module module Authentica...
I want to create a collection in VB.NET, but I only want it to accept objects of a certain type. For example, I want to create a class called "FooCollection" that acts like a collection in every way, but only accepts objects of type "Foo". I thought I could do this using generics, using the following syntax: Public Class FooCollect...
What is the best way to sort class members? I'm in conflict with a team member about this. He suggests that we should sort the members alphabetically. I think it's better to organize in a semantic manner: important attributes first, related methods together, etc. What do you think? ...
Very simply put: I have a class that consists mostly out of static public members, so I can group similar functions together that still have to be called from other classes/functions. Anyway, I have defined two static unsigned chars in my class' public scope, when I try to modify these values in the same class' constructor, I am gettin...
I want to do some checking in a writer accessor. My first idea was returning a boolean. class MyClass def var=(var) @var = var # some checking return true end end m = MyClass.new retval = (m.var = 'foo') => "foo" Can I set a return value in a writer accessor? If yes, how can I get this value? ...
When you create an instance of a class with the new operator, memory gets allocated on the heap. When you create an instance of a struct with the new operator where does the memory get allocated, on the heap or on the stack ? ...
I have code like this: template <typename T, typename U> struct MyStruct { T aType; U anotherType; }; class IWantToBeFriendsWithMyStruct { friend struct MyStruct; //what is the correct syntax here ? }; What is the correct syntax to give friendship to the template ? ...
Is there a way to hide private data members of a C++ class away from its users, in the cpp file? I think of the private members as part of the implementation and it seems a little backwards to declare them in the header file. ...
The following seems strange.. Basically, the somedata attribute seems shared between all the classes that inherited from the_base_class. class the_base_class: somedata = {} somedata['was_false_in_base'] = False class subclassthing(the_base_class): def __init__(self): print self.somedata first = subclassthing(...