const_cast member function pointer

Newsgroup: comp.lang.c++

Subject: const_cast member function pointer

From: nick.keighley.zczc@...

Date: Fri, 25 Oct 2013 02:49:25 -0700 (PDT)



Yes I read the FAQ! I'm not using a typedef as they don't seem to work with templates in C++98.





template<typename WB>

void EditProgramWizard::PopulateButton (MParameterButton* paramButton, WB* band,

int (WB::*read)(),

void (WB::*write)(int))

{

int (WB::*const_read)() = const_cast<int (WB::*)() const> (read);

PopulateButton (paramButton, band, const_read, write);

}



the cast fails with:



myprog.cpp: In member function ?void EditProgramWizard::PopulateButton(MParameterButton *, WB*, int (WB::*)(), void (WB::*)(int)) [with WB = WeightBand]?:

myprog.cpp:464:125: instantiated from here

myprog.cpp:1521:68: error: invalid use of const_cast with type ?int (WeightBand::*)()const?, which is not a pointer, reference, nor a pointer-to-data-member type



I was under the impression ?int (WeightBand::*)()const' *was* a pointer.



Oh. Are pointers to member functions not const castable?

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