Question

I would like to pass a COM method as a function argument but I get this error (Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 15.00.30729.01 for 80×86):

error C3867: ‘IDispatch::GetTypeInfoCount’: function call missing argument list; use ‘&IDispatch::GetTypeInfoCount’ to create a pointer to member

What am I missing?

Thank you very much.

#include <atlbase.h>  void update( HRESULT(*com_uint_getter)(UINT*), UINT& u ) {    UINT tmp;    if ( S_OK == com_uint_getter( &tmp ) ) {       u = tmp;    } }  // only for compile purpose, it will not work at runtime int main(int, char*[]) {    // I choose IDispatch::GetTypeInfoCount just for the sake of exemplification    CComPtr< IDispatch > ptr;    UINT u;    update( ptr->GetTypeInfoCount, u );    return 0; } 

Answer 1

As morechilli pointed out this is a C++ issue. Here it is the solution, thanks to my colleague Daniele:

#include <atlbase.h>  template < typename interface_t > void update( interface_t* p, HRESULT (__stdcall interface_t::*com_uint_getter)(UINT*), UINT& u ) {    UINT tmp;    if ( S_OK == (p->*com_uint_getter)( &tmp ) ) {       u = tmp;    } }  // only for compile purpose, it will not work at runtime int main(int, char*[]) {    // I choose IDispatch::GetTypeInfoCount just for the sake of exemplification    CComPtr< IDispatch > ptr;    UINT u;    update( ptr.p, &IDispatch::GetTypeInfoCount, u );    return 0; }