Re: [Boost-users] boost::bind/boost::function and fast, delegates

Subject: Re: [Boost-users] boost::bind/boost::function and fast, delegates
From: John M. Dlugosz (mpbecey7gu_at_[hidden])
Date: 2013-01-23 03:16:07

On 1/22/2013 4:34 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote:
> And if you still wish to write such a lib(s) take a look at this article:
>
> http://www.codeproject.com/Articles/7150/Member-Function-Pointers-and-the-Fastest-Possible

Coincedentely, that article references my project that I cited on another thread (shared 
pointers):

> For Microsoft's (and Intel's) ugly, non-standard 12 byte |virtual_inheritance| pointers, 
> yet another trick is used, based on an idea invented by John Dlugosz. 

To pass bound member functions to legacy code (including OS API) that expects a genuine 
function pointer, I generated a thunk at run-time and used a compiler trick to get the 
information I needed regarding the 'this' adjustment.  It is certainly the _fastest_ 
possible; but I did not elaborate on a full "bind" feature like Boost (and std) eventually 
came up with.  In fact, I simplified my own code so that all the arguments to pass were 
just members of one structure, so I only worried about the case of binding to a member 
function with one argument.  It didn't automatically capture smart-pointer objects for the 
binding, but I handled that separately since it was already being done for "windows" owned 
by the OS's reference to raw pointers; I had my own fake +1 count as part of the object, 
and Window objects were my primary interest.

As I recall, the C++11 lambda spec provides for a primitive C function pointer to be 
coughed up, but I've not yet used a compiler that can do that.