Re: [Boost-users] [bind] Pointer as third parameter

Subject: Re: [Boost-users] [bind] Pointer as third parameter
From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2008-12-18 08:18:12

Jean-Pierre Bergamin wrote:
> Dear boost-Users
> 
> I'm having problems with calling a function that takes a pointer as the 
> third argument through bind.
> I cannot explain, why the code below does not compile with the function 
> 'op3' enabled. When changing f3 to void f3(int a, int b, int c) { } it 
> also works. I don't see any reasony why this should fail, since f2 also 
> works.
> 
> Any ideas how to solve this?
> 
> // ---------------------------------------
> void f3(int a, int b, int *c) { }
> void f2(int a, int *b) { }
> 
> template <typename F> void op3(F f) {
>    int a = 1, b = 2, c = 3;
>    f(a, b, &c);
> }
> 
> template <typename F> void op2(F f) {
>    int a = 1, b = 2;
>    f(a, &b);
> }
> 
> void call() {
>    op2(boost::bind(&f2, _1, _2));
>    //op3(boost::bind(&f3, _1, _2, _3));
> }
> // ---------------------------------------

Works for me on MSVC 8 w/ 64bit disabled.

> MSVC 8 fails with:
> 
> .\test.cpp(19) : error C2664: 'void boost::_bi::bind_t<R,F,L>::operator 
> ()<int,int,int*__w64 >(A1 &,A2 &,A3 &) const' : cannot convert parameter 
> 3 from 'int *__w64 ' to 'int *__w64 &'
>        with
>        [
>            R=void,
>            F=void (__cdecl *)(int,int,int *),
>            L=boost::_bi::list3<boost::arg<1>,boost::arg<2>,boost::arg<3>>,
>            A1=int,
>            A2=int,
>            A3=int *__w64
>        ]
>        .\Sleep.cpp(29) : see reference to function template 
> instantiation 'void 
> op3<boost::_bi::bind_t<R,F,L>>(boost::_bi::bind_t<R,F,L>)' being compiled
>        with
>        [
>            R=void,
>            F=void (__cdecl *)(int,int,int *),
>            L=boost::_bi::list3<boost::arg<1>,boost::arg<2>,boost::arg<3>>
>        ]

Did you try:

void f3(int a, int b, int* __w64 c) { }

Jeff