🚀 go-pugleaf

Glenn M. Poorman (poorman@cc4032.pms.ford.com) wrote:
: In article <2q65gv$oln@bigblue.oit.unc.edu>, brandon@uncvx2.oit.unc.edu (Brandon Van Every) writes:
: |> Paul Durbin (pauld@verdix.com) wrote:
: |> : I attempt to use a member function as callback but all three arguments (to the
: |> : callback) are garbage. If I make it a friend then the arguments are correct,
: |> : but then I can't get to the class data, without reference thru an instance of
: |> : the class and I don't want the data to be static.
: |> 
: |> : So, what is causing this problem? 
: |> 
: |> Motif is based on C, not C++.  You have to use "extern C" linkage for any of
: |> your callbacks.  You can't register any C++ function directly.  You have to
: |> write a plain C front end for anything you want to have callbacked.

: Actually the function does not have to have "extern C" linkage.  It just
: can't be a non-static member function.


I can't find anything in Stroustrup that says this will work.  The default
linkage for all functions is "C++" (p. 524).  Given that, I'd say that not
using "extern C" is rather risky.

Cheers,
Brandon

--
Brandon Van Every             "No more LaunchPAD .Sigs!  HA HA HA HA HA HA!!!"
brandon@uncvx2.oit.unc.edu