* GNAT/C++ & Multiple constructors @ 2004-02-27 2:05 Luke A. Guest [not found] ` <m2d67yjcml.fsf@jvdsys.demon.nl> 0 siblings, 1 reply; 2+ messages in thread From: Luke A. Guest @ 2004-02-27 2:05 UTC (permalink / raw) Hi, I'm new to OO in Ada, but I've built a simple example which has a C++ class imported into GNAT successfully. Is there any way to get multiple constructors working? Why does Ada require a vtable when importing C++ classes which have no virtuals? Thanks, Luke. ^ permalink raw reply [flat|nested] 2+ messages in thread
[parent not found: <m2d67yjcml.fsf@jvdsys.demon.nl>]
* Re: GNAT/C++ & Multiple constructors [not found] ` <m2d67yjcml.fsf@jvdsys.demon.nl> @ 2004-02-29 17:09 ` Luke A. Guest 0 siblings, 0 replies; 2+ messages in thread From: Luke A. Guest @ 2004-02-29 17:09 UTC (permalink / raw) On Sun, 29 Feb 2004 13:25:54 +0100, Jerry van Dijk wrote: > > "Luke A. Guest" <laguest@n_o_p_o_r_k_a_n_d_h_a_m.abyss2.demon.co.uk> writes: > >> I'm new to OO in Ada, but I've built a simple example which has a C++ >> class imported into GNAT successfully. Is there any way to get multiple >> constructors working? > > It's been a while since I used it, but I would thing that simply > declaring multiple CPP_Constructor pragma's would work. Doesn't it ? Nope, not under GNAT. >> Why does Ada require a vtable when importing C++ classes which have no >> virtuals? > > Note that Ada does not require anything as it does not interface with C++. > GNAT has an extension for it. Yeah, I know. > As for the vtable, the GNAT documentation says: > > If (and only if) the type is tagged, at least one component in the > record must be of type `Interfaces.CPP.Vtable_Ptr', corresponding > to the C++ Vtable (or Vtables in the case of multiple inheritance) > used for dispatching. > > With other words, if the type is not tagged, you do not need a vtable. Yeah, I just couldn't get it to work. Anyway, I decided to try to C-ify the interface and import C functions ;-) Much more portable. Luke. ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2004-02-29 17:09 UTC | newest] Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-02-27 2:05 GNAT/C++ & Multiple constructors Luke A. Guest [not found] ` <m2d67yjcml.fsf@jvdsys.demon.nl> 2004-02-29 17:09 ` Luke A. Guest
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