Re: Help needed with function pointer examples

Hans-Peter Diettrich <DrDiettrich1@aol.com>
Tue, 17 Jan 2012 16:28:38 +0100

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From: Hans-Peter Diettrich <DrDiettrich1@aol.com>
Newsgroups: comp.compilers
Date: Tue, 17 Jan 2012 16:28:38 +0100
Organization: Compilers Central
References: 12-01-006 12-01-026 12-01-029
Keywords: OOP
Posted-Date: 17 Jan 2012 11:21:04 EST

Torben Fgidius Mogensen schrieb:
> The moderator opined:
>> [Any program written in an OO language that allows inheritance or
>> overloading uses function pointers, since that's how they're
>> implemented. -John]
>
> If the inheritance and overloading can be resolved statically, function
> pointers are not needed. But most OO languages use dynamic method
> resolution by default, so what you say applies to nearly all OO
> implementations.


IMO the key is *virtual* methods, which require dynamic lookup in a
Virtual Method Table or similar structure.


In non-OO languages calling conventions like "call by name" also can
require dynamic lookup of function addresses.


Sorting and searching algorithms also typically are implemented with a
compare function (pointer) argument.


DoDi


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