[boost] boost::function error

From: Taggu Ani (ataggu_at_[hidden])
Date: 2002-04-01 20:17:46

Hello:

I have a function ptr of type CBRoutineT below.

struct OpaqueDataT; //incomplete type decl ok because
only ptr used?
typedef void  CBRoutineT(OpaqueDataT *);

When I do this everything is ok:

 boost::function<void, OpaqueDataT *> f1 =
yieldcallback; //ok

where yieldcallback is of type CBRoutineT *).

However, I want to assign 'yieldcallback' to a
function object wrapper of type:

boost::function<void, boost::any>

The first argument has changed from OpaqueDataT * to
boost::any. That does not work.

 //replacing the arg from OpaqueDataT * to boost::any
gives error.
 boost::function<void, boost::any> f2 = yieldcallback;
//error

VC++ 6.0 issues the error:
c:\virtualsilicon\vs\vre\debuggers\shared\boost\function\function_template.h
pp(94) : error C2664: 'void (struct OpaqueDataT *)' :
cannot convert parameter 1 from 'class boost::any' to
'struct OpaqueDataT *'

What is the right way to handle this?

Thanks,
-Ani

//---- example program -----
#include "boost/any.hpp"
#include "boost/function.hpp"

struct OpaqueDataT; //incomplete type ok because only
ptr used?
typedef void  CBRoutineT(OpaqueDataT *);

void MyCB (CBRoutineT *yieldcallback, OpaqueDataT
*cbdata)
{
 boost::function<void, OpaqueDataT *> f1 =
yieldcallback; //ok
 //replacing the arg from OpaqueDataT * to boost::any
gives error.
 boost::function<void, boost::any> f2 = yieldcallback;
//error
}

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