Wednesday, February 15, 2012

method registry in a c# class - messier than java/c++

Background: perl has a symbol table for package (not lexical) variables.

Background: Python has a __dict__ to hold fields and methods -- collectively known as "attributes" since python doesn't really differentiate -- a bold departure from c++/java/c# tradition. Another (bolder) departure -- each Python class has a __dict__ and each class instance has __dict__ too.

Now, let's look into a c# class MyClass implementing/inheriting a bunch of PUBLIC methods of the same name. This example is adapted from P109 [[c#precisely]]. MyClass"registry" of all available methods is complicated by the "new"/hiding feature and other features. MyClass can expose completely distinct implementations of --

* new virtual void M(){..}//declared in MyClass itself, hiding a base class virtual-void-M()
* void Interface_1.M() // same return type as above
* void Interface_2.M() // same return type as above.
//Note above Interface_2 extends Interface_1 but hides void-M() with an identical void-M()
// I think IEnumrable and IEnumerable<T> require implementations to adopt this  technique
//----------------------
//----------------------
//Note below Interface_3 extends Interface_2 but overloads void-M() with int-M().
//Unlike java/c++ this overload has identical parameter set but different return type
//Note this overload uses no "new" so no hiding
* int Interface_3.M()

// regular overloads, just like c++ and java
* void M(int)
* float M(float)

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