overriding

I want to be able to tell at run-time if an instance of a class implements a virtual function. For example: struct Base { virtual void func(int x) { <default behavior here> } virtual void func2(int x) { <default behavior here> } }; struct Deriv : Base { virtual void func(int x) override { <new behavior here> } }; int main() { Base *d = new Deriv; if(implements<Base::func(int)>(d)) // This should evaluate true {} if(implements<Base::func2(int)>(d)) // This should evaluate false {} } I have seen this but it's dated and there might be a something that c++11/14 has to say now: Ways to detect

Ok. This is a big one. I'll try and explain my issue but let me know if you need more info. I would like to alter the HTML that SharePoint 2010 generates. I'm going to use the HTML Agility Pack] which will take a string of HTML among other objects and alter the source. There are 2 ways of altering the full source in SP. Using Control Adapters, or Extending Controls I can access the Page, MasterPage or even ContentPlaceHolder render methods, grab the HTML, Alter it and then write it. Use a HTTP Module with a filter and alter the output stream Unfortunately there are issues with both of these

Possible Duplicate: Intercept operator lookup on metaclass How can I intercept calls to python’s “magic” methods in new style classes? Consider the following code: class ClassA(object): def __getattribute__(self, item): print 'custom__getattribute__ - ' + item return '' def __str__(self): print 'custom__str__' return '' a=ClassA() print 'a.__str__: ', a.__str__ print 'str(a): ', str(a) The output was surprising to me: a.__str__: custom__getattribute__ - __str__ str(a): custom__str__ Isn't str(a) supposed to be mapped to the magic method a.__str__() ? If I remove the custom ClassA.__str__() ,

I have been reading about how best to override the equals method when dealing with subclasses and here I have found quite a few posts. They recommend different ways of implementing a solution using instanceof or getClass() to compare objects of different sub classes. However with reference to Effective Java, my understanding is (and I am new to this so I may well be wrong!) Bloch argues that in the end both can be problematic, “There is no way to extend an instantiable class and add a value component while preserving the equals contract, unless you are willing to forgo the benefits of object

I need to overwrite the XMLWriter's method "WriteElementString" to not write the element if the value is empty, the code bellow didn't work, tried override and new keywords but it still goes to the framework method. public static void WriteElementString(this XmlWriter writer, string localName, string value) { if (!string.IsNullOrWhiteSpace(value)) { writer.WriteStartElement(localName); writer.WriteString(value); writer.WriteEndElement(); } } The answer was close but correct solution is: public abstract class MyWriter : XmlWriter { private readonly XmlWriter writer; public Boolean

I have a function that in a different frame that I need to override. In addition, I need to call the original function from within my override. To do so, I'm using the following: myFrame.SomeFunction = (function () { var originalSomeFunction = myFrame.SomeFunction; return function(arg1, arg2, arg3) { alert('In override!'); originalSomeFunction(arg1, arg2, arg3); }; })(); When I execute this code, I get "Can't execute code from a freed script". Thoughts? Is there a better way to do this? Testing in IE 6,7,8 and 9. You cannot do that in IE, you've discovered. You need to make sure that any

What happens when you use a memory override prefix but all the operands are registers? So, let's say you code mov eax, ebx or add eax, ebx and the default is 32-bit but you use a 67h override. How does the processor handle that situation? The Intel Software Developer's Manual*, volume 2, section 2.1, details the behavior of each instruction prefix. It says use of the address-size prefix (67h) with an instruction that doesn't have a memory operand is reserved and may cause unpredictable behavior. The operand-size prefix (66h) may be used to switch between 16- and 32-bit operand sizes and also