I\'d appreciate it if someone would enlighten me on the following behavior -- I\'ve captured it with a short code example:
In the example below (from my coursepack), we want to give to the Square instance c1 the reference of some other object p1, but on开发者_StackOverflow中文版ly if those 2 are of compatible types.
I need to display/edit polymorphic entities. My abstract class is Person. 开发者_如何学运维My concrete classes are PhysicalPerson and MoralPerson
I\'m sure I remember reading that开发者_如何学运维 there is a way to make any subclass of the superclass define certain methods. How do I do it?
I have written some VSTO (2003) code that sucessfully applies some mandatory subject line changes according to attachements of mail items. The code is written to operate on microsoft.office.interop.ou
Numeric literals have a polymorphic type: *Main> :t 3 3 :: (Num t) => t But if I bind a variable to such a literal, the polymorphism is lost:
class Base {} class Sub : Base {} void AddNewBase(Base t, LinkedList<Base> list){ ... } ... { Sub asub = new Sub();
I\'m trying to figure out why some code bases use IsA() to det开发者_JAVA技巧ermine object polymorphism if in C++ you can already safely upcast and down cast (using dynamic_cast) ?
Suppose I have the following classes: class car1 {} class car2 {} class car3 {} class car4 {} Support I also have the method: queryCar()
I know that polymorphism can add a noticeable overhead. Calling a virtual function is slower than calling a non-virtual one. (All my experience is about GCC, but I think/heard that this is true for an
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