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C# question

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Started by oatz01 October 03, 2007 02:25 AM

3 comments, last by oatz01 16 years, 6 months ago

oatz01

124

Author

October 03, 2007 02:25 AM

In C++ you can have function pointers as arguements using a declaration like

void func(void (*func2)());

Is there similar functionality in C#?

Sijmen

231

October 03, 2007 02:51 AM

Delegates.

delegate void IntMethod(int value);// ...void JustPrintIt(int value){	Console.WriteLine(value);}void CallFunction(IntMethod method, int value){	method(value);}// ...CallFunction(JustPrintIt, value);

(untested)

Skizz

794

October 03, 2007 02:52 AM

Yes, they are called delegates and look like:

access delegate return_type DelgateName (function parameters);

So, in your case:

public delegate void Func2 ();public void Func (Func2 func2){}

Skizz

ernow

732

October 03, 2007 03:08 AM

Yes, delegates are the way to this in C# however you should be aware that delegates are more than just function pointers.
A few extras to note:
Delegates are classes; they have methods and properties
Delegates can point to multiple functions (multicast delegates)
Delegates have built-in support for asynchronous calls.
When trying to implement properties of delegates, consider using events. Events are 'ecapsulated' delegate properties.