* Can ADA95 inherit from C++ classes
@ 1997-09-16 0:00 Daniel E Griffin
1997-09-16 0:00 ` Stephen Leake
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Daniel E Griffin @ 1997-09-16 0:00 UTC (permalink / raw)
I have heard that on the project I'm on they are planning on inheriting
from C++ classes in their Ada 95 code. Is this possible and if so how?
Thanks in advance,
Dan.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: Can ADA95 inherit from C++ classes 1997-09-16 0:00 Can ADA95 inherit from C++ classes Daniel E Griffin @ 1997-09-16 0:00 ` Stephen Leake 1997-09-17 0:00 ` Robert Dewar 1997-09-18 0:00 ` Stephen Leake 2 siblings, 0 replies; 6+ messages in thread From: Stephen Leake @ 1997-09-16 0:00 UTC (permalink / raw) Daniel E Griffin wrote: > > I have heard that on the project I'm on they are planning on inheriting > from C++ classes in their Ada 95 code. Is this possible and if so how? > > Thanks in advance, > Dan. This is compiler dependent; GNAT and ObjectAda support it. You'll have to consult the documentation for details; look for pragma Import. ObjectAda for Windows NT/95 (at one of their price points) comes with a binding to Microsoft's Foundation Classes. -- - Stephe ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can ADA95 inherit from C++ classes 1997-09-16 0:00 Can ADA95 inherit from C++ classes Daniel E Griffin 1997-09-16 0:00 ` Stephen Leake @ 1997-09-17 0:00 ` Robert Dewar 1997-09-18 0:00 ` Stephen Leake 2 siblings, 0 replies; 6+ messages in thread From: Robert Dewar @ 1997-09-17 0:00 UTC (permalink / raw) Dan asks <<I have heard that on the project I'm on they are planning on inheriting from C++ classes in their Ada 95 code. Is this possible and if so how?>> GNAT contains features that allow this kind of operation. These features are fully implemented on the SGI environment, and are used to interface to the SGI graphics libraries. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can ADA95 inherit from C++ classes 1997-09-16 0:00 Can ADA95 inherit from C++ classes Daniel E Griffin 1997-09-16 0:00 ` Stephen Leake 1997-09-17 0:00 ` Robert Dewar @ 1997-09-18 0:00 ` Stephen Leake 1997-09-19 0:00 ` Robert Dewar 2 siblings, 1 reply; 6+ messages in thread From: Stephen Leake @ 1997-09-18 0:00 UTC (permalink / raw) Daniel E Griffin wrote: > > I have heard that on the project I'm on they are planning on inheriting > from C++ classes in their Ada 95 code. Is this possible and if so how? > > Thanks in advance, > Dan. In another response I said ObjectAda could do this. That's wrong; ObjectAda can _import_ C++ classes as packages, but it cannot _inherit_ from C++ classes. Sorry for the misunderstanding. -- - Stephe ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can ADA95 inherit from C++ classes 1997-09-18 0:00 ` Stephen Leake @ 1997-09-19 0:00 ` Robert Dewar 1997-09-22 0:00 ` John G. Volan 0 siblings, 1 reply; 6+ messages in thread From: Robert Dewar @ 1997-09-19 0:00 UTC (permalink / raw) Stephen said <<In another response I said ObjectAda could do this. That's wrong; ObjectAda can _import_ C++ classes as packages, but it cannot _inherit_ from C++ classes. Sorry for the misunderstanding.>> Just to make sure that things are clear, GNAT *can* import C++ classes, including multiply inherited classes from C++, treat them as tagged types, extend them with new primitive operations, and pass the resulting tagged type back to C++ to be treated as an extended class. However, this is a complex mechanism, and has to be tailored to a particular C++ compiler, since it obviously depends on Ada and C++ using identical data structures for the objects. This tailoring is done by modifying the body, and possibly the private part of the package Interfaces.CPP. Furthermore, to use the interfacing capability, a rather complex set of pragmas is required. These pragmas can be generated by hand, but it is a tricky process. SGI has a binding generator that automatically generates these pragmas for their Delta C++ technology compiler used together with GNAT. People have experimented successfully with example bindings to C++ in other environments (e.g. Microsoft C++), but for this feature to be fully usable, a binding generator is most desirable. Such a binding generator is not a trivial tool, since it needs full understanding of the C++ sources, and must therefore be built around a C++ front end. Ada Core Technologies hopes to introduce a binding generator capable of handling this problem some time in the future, but there is no definite schedule for this work. Meanwhile, it is most certainly possible to import C++ classes as packages, if necessary by using a C wrapper to ensure maximum portability. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can ADA95 inherit from C++ classes 1997-09-19 0:00 ` Robert Dewar @ 1997-09-22 0:00 ` John G. Volan 0 siblings, 0 replies; 6+ messages in thread From: John G. Volan @ 1997-09-22 0:00 UTC (permalink / raw) Robert Dewar wrote: > > People have experimented successfully with example bindings to C++ in > other environments (e.g. Microsoft C++)... If anyone has successfully ported GNAT's Interfaces.CPP to Microsoft Visual C++, I would very much like to know! Something that can provide a real binding to the Microsoft Foundation Classes without sacrificing the OO-ness of either C++ or Ada95 is extremely desirable! -- ------------------------------------------------------------------------ Internet.Usenet.Put_Signature (Name => "John G. Volan", Employer => "Raytheon/TI Advanced C3I Systems, San Jose, CA", Work_Email => "jvolan@ti.com", Home_Email => "johnvolan@sprintmail.com", Slogan => "Ada95: World's *FIRST* International-Standard OOPL", Disclaimer => "My employer never defined these opinions, so using " & "them would be totally erroneous...or is that just " & "nondeterministic behavior now? :-) "); ------------------------------------------------------------------------ ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~1997-09-22 0:00 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 1997-09-16 0:00 Can ADA95 inherit from C++ classes Daniel E Griffin 1997-09-16 0:00 ` Stephen Leake 1997-09-17 0:00 ` Robert Dewar 1997-09-18 0:00 ` Stephen Leake 1997-09-19 0:00 ` Robert Dewar 1997-09-22 0:00 ` John G. Volan
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