Re: [Cppunit-devel] TestSuiteBuilder & type info...

[Bastiaan B. <bas...@li...>]

Baptiste Lepilleur wrote:
-8<--

> > They only thing we need (at least for the TestSuiteBuilder) is the fully
> > qualified class name of the Fixture. In case of the macros we already
> > got that.
>   You don't need to specify the full name in the macro. This would be hell when
> you need five lines of code to specify that name. Even if you do, you don't get
> the actual template parameter type.
>
>   For example:
>   template<class StringType>
>   class StringTest;
>
>   Test *testStringChar = StringTest<char>::suite();
>   Test *testStringWChar = StringTest<wchar_t>::suite();
>
>   In the macro you would get the same name for both suite, with RTTI you get
> StringTest<char> and StringTest<unsigned short> (with VC++), which is very
> useful when one fail but not the other.
>
>   This become important when you have 4 or 5 parameters which might themself be
> template (see this month expert column on generic programming in cuj for
> example: http://www.cuj.com/experts/1906/alexandr.htm?
> topic=experts&topic=experts )
>

OK, finally I start to understand what you mean! :-)
I've mostly been doing Java programming the last few years. No generics there,  so
I'm not too intimate with those and some other C++ features.
Thanks for the C++ Journal link. Interesting information, the author is pretty
sick bastard though: calling writing a dozen basic_string implementations 'fun'
:-D
I must be a C++ wimp ;-)

--8<--

>   I'm not saying that on windows you should only use RTTI. If you do a project
> that might be ported to Unix then you must not use RTTI. But RTTI provides
> useful functionnality when working with template and namespace and when you
> know that you will never go for another platform with a project you might as
> well use them.

I don't care what people do on their own projects: they should be free to keep any
platform dependencies they want.
My worry is that the more platform dependent features get into CppUnit the more
difficult it becomes to maintain:  people on other platforms cannot check whether
they break these features, more code than neccessary may come to depend on it,
etc. ,etc.

>
>   I've added a configuration to VC++ projects that do not use RTTI (that how I
> found out that AutoRegisterSuite did not work without RTTI).
>   It will be in this evening commit too.
>

OK, do what's necessary for the RTTI features. Now that I understand how it may be
useful, I would not want to keep excluding it from the project.

>
> > Do you mean removal of the 'registerFactory( TestFactory *factory )' or
> > the
> > whole class?
> > The registerFactory method is used in AutoRegisterSuite.h and
> > HostAppDoc, so
> > thes would be affected too. Please explain, or hack at will.
>   Euhh... I completly forgot it was used but I've done a workaround. see
> somewhere above.
>
> > g++ isn't as bad as the standard allows: the type_info name does not
> > change
> > between runs (and not even compilations AFAIK). But the mangled names
> > have
> > changed between 2.91, 2.95 and 2.96+.
>   OK. This is better than I though it was. Yet, not very usable for cppunit.
>

Indeed, it isn't. I'll see if I can get the reasoning behind from one of the g++
folks.

>
> > OK, as long as the name is only interpreted by humans, we can get away
> > with the
> > variance in the name. But once the name ends up being processed
> > automatically
> > somewhere, e.g. for multiplatform regression reporting, we're can run
> > into
> > trouble.
>   If I were to do multiplatform, I think I would name the test by hand to
> ensure that they have the same name. That is the cost of multiplatform, you
> must stick to the lowest common factor. The problem is often to find that
> lowest common factor. For cppunit, it is easily identified: do not use RTTI if
> you are doing multiplatform. We just have to stick it somewhere in the
> documentation (I'll put it in TestSuiteBuilder at the current time). But I
> would put it somewhere else. This fact is binded to the CU_USE_TYPEINFO macro,
> not TestSuiteBuilder. Any Suggestions on where to put that ?
>

With the TypeInfoHelper class?

Bastiaan


>
> ---
> Baptiste Lepilleur <gai...@fr...>
> http://gaiacrtn.free.fr/index.html
> Language: English, French
>
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