[Boost-users] Boost.Function __stdcall, __fastcall, etc

Subject: [Boost-users] Boost.Function __stdcall, __fastcall, etc
From: Brian Rowlett (brianjrowlett_at_[hidden])
Date: 2010-04-25 22:50:21

I am writing a DLL that gets injected into another process, and creates
pointers to the target processes functions. The target process uses all 3
calling conventions, __stdcall, __fastcall and __cdecl.

I have created a class whos constructor gets the address of the function,
and passes it to the base class boost::function:

> template <typename _Signature, enum LibraryId _LibraryId, int _Offset>
> class FunctionPointer: protected OffsetPointer, public
> boost::function<_Signature>
> {
> public:
>     FunctionPointer(void)
>     : boost::function<_Signature>( OffsetPointer::_getOffset(_LibraryId,
> _Offset )
>     { return; }
> };
>

I instantiate this with:

> FunctionPointer<return_type__stdcall( argument_types ), LibraryId, Offset>
> Function;

FunctionPointer<return_type __cdecl( argument_types ), LibraryId, Offset>
> Function;

Whatever calling convention Visual Studio is setup to use (__cdecl by
default), works just fine. But trying to instantiate it with another calling
convention gives the following error:

> Error 1 error C2504: 'boost::function<Signature>' : base class undefined

It seems weird that it would work for some calling conventions, and not
others..

Any ideas?

-- 
+ Brian J. Rowlett