Function as parameters

BlitzMax Forums/BlitzMax Programming/Function as parameters

markcw

(Posted 2015) [#1]

I'm trying to wrap a function as parameter in cpp and have no idea what I'm doing.

This thread shows how to pass function as parameter but what if the function is in cpp?

In cpp:

void FluidFunction(Fluid* fluid, float (*FieldFunction)(float, float, float)){
	fluid->FluidFunction(FieldFunction);
}

void Fluid::FluidFunction(float (*FieldFunction)(float, float, float)){
	ScalarField=FieldFunction;
}

I have this, which I know is wrong:

	Function FluidFunction_( fluid:Byte Ptr, FieldFunction:Float( Float, Float, Float ) ) = "FluidFunction"

Function FluidFunction( fluid:TFluid, FieldFunction:Float( Float, Float, Float ) )
	FluidFunction_( TUtility.IsObject( fluid ), FieldFunction )
End Function

Yasha

(Posted 2015) [#2]

You have to give the parameters to the function pointer names, for some reason:

Function FluidFunction_( fluid:Byte Ptr, FieldFunction:Float( _0:Float, _1:Float, _2:Float ) ) = "FluidFunction"

Function FluidFunction( fluid:TFluid, FieldFunction:Float( _0:Float, _1:Float, _2:Float ) )
	FluidFunction_( TUtility.IsObject( fluid ), FieldFunction )
End Function

It doesn't matter what the names are. They won't be read by anything, it just doesn't seem to know how to parse types on their own.

Other than that... looks fine. C++ part looks OK.

markcw

(Posted 2015) [#3]

Thanks! It compiles but I haven't tested the function yet. Good to know this is so straight-forward.