overriding

Okay, sample code first; this is my attempt at communicating what it is that I'm trying to do, although it doesn't compile: #include <iostream> template <class T> class Base { public: virtual void my_callback() = 0; }; class Derived1 : public Base<int> , public Base<float> { public: void my_callback<int>() { cout << "Int callback for Derived1.\n"; } void my_callback<float>() { cout << "Float callback for Derived\n"; } }; class Derived2 : public Base<int> , public Base<float> { public: void my_callback<int>() { cout << "Int callback for Derived2.\n"; } void my_callback<float>() { cout << "Float

Is there a better way then using VQMOD / OCMOD to change OpenCart's core files? Is there some "overrides" folder exists so that I can simply create any PHP file corresponding to the file structure and simply override a core file? (Like it is possible in PrestaShop and Magento ). VQMOD / OCMOD is highly inconvenient. Does someone use any hacks & tricks to achieve the result? I don't want to touch any core files to keep the system clean and manageable. Thanks a lot! If you want to call your function within the system which follows the OC structure, avoid the search/replace mods, try using the

Does the return type influence on function overriding? (As far as I know return typde is not a part of a function/method signature) In a base class I have a function, which doesn't get arguments, returns int and is pure virtual. In each derived class, I define an enum for the return type.The function is overridden in the derived classes, i.e. it has the same signature but different behavior. The question is: Is that legal for overriding and return type is not a part of function overriding? Code example: class Base { public: typedef int ret; virtual ret method() = 0; }; class Der1 { public:

I'm wondering if it is possible to override the default value of a field when it is returned. Say I had a model: class ModelA(models.Model) name = models.CharField(max_length=30) Is there any way that calling modela_instance.name can return a modified value, for example name + " foo", but have the code that appends foo run by default within the model itself, so all I would need to do is call name to get the appended value? I should elaborate and say that what I'm actually hoping to do is have a method within the model: def get_name(self): return self.name + " foo" or similar, and just want

I know this might be crazy but today one of my friend puzzled by asking when we implement an interface in java is it considered as method overriding. I told him it is not overriding as we are providing working(definition) of method first time when we implement any interface. To support multiple inheritance java provide interface but he was not convinced and was arguing. Please bring some light on to the topic. The term "overriding" applies when there is an existing implementation of the method . The correct term is "implementing" for interfaces and other abstract declarations. The @Override

I want to change the width and height of jquery slider UI. I am using ui-lightness theme. I tried to override the default jquery.css by adding the following code in my style sheet. .ui-slider .ui-slider-horizontal { height: .6em; } .ui-slider .ui-slider-handle { position: absolute; z-index: 2; width: 1em; height: 1em; cursor: default; } But the above css has no effect. jquery.css overrides the above style and I see no change in the slider. How to override the default jquery.css styles? Try adding the !important rule over after your width and height declaration, like so: width:1em !important;

Here's a simplified version of my class: public abstract class Task { private static object LockObject = new object(); protected virtual void UpdateSharedData() { } protected virtual void UpdateNonSharedData() { } public void Method() { lock(LockObject) { UpdateSharedData(); } UpdateNonSharedData(); } } I'm trying to hide the locking code from derived classes. But I only want to obtain the lock if the derived class overrides UpdateSharedData; if it doesn't, I don't want the method to block and wait on all of the other running instances that do update shared data before it updates the non