CODEWITHSUNDEEP
cgenericsfunctionpointerscall
amrzar
amrzar

Reputation: 367

Calling C function by generic pointer

Is there any method to call a function, by just knowing its address in a pointer, lets say a pointer of type "void *(*)(void *)", and number and type of its parameter?

The function could have any number of parameters!

Upvotes: 3

Views: 223

Answers (2)

Ben Voigt
Ben Voigt

Reputation: 283674

No, not in any portable or standard way.

However, there is a standard way to pass a variable number of arguments between functions. Have a look at vsprintf. Basically, you need a version of the function that accepts a va_list.

Upvotes: 5

Jonathan Leffler
Jonathan Leffler

Reputation: 753900

Roughly, no.

You have to know the number of parameters before you can write the call, and therefore the types too. Therefore, you cannot write one line of code that accurately calls a function that takes 0 parameters or 1 parameter or 2 parameters. You could always provide 2 and trust things will work - but the compiler will (justifiably) give warnings.

Upvotes: 2

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