Re: Test suites

["Anthony Williams" <anthony_w dot geo at yahoo dot com>]

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From: Benjamin Kosnik <bkoz@cygnus.com>
Sent: 05 June 2000 18:02
> > A large number of the test programs utilise implementation
> > details of, e.g. filebuf. Is this just to make testing easier, or
> > is it to exercise specific features of the implementation, or a
> > mixture? For the former, would it be possible to use more generic
> > methods, so that the test suite can be used to compare the
> > functionality of libstdc++-v3 against the native C++ library for
> > the platform, or any other supposedly standard-compliant library?
> 
> Can you give specific examples? I'm unclear on the details.
> 

Specifically, the iostream tests use such things as
fpos<>._M_position(), and filebuf._M_buf_size_opt, and
numpunct<>._M_init, which are implementation details not available on
other implementations of the library, such as that shipped with
Microsoft Visual C++.

> In general, yes, it would be nice to abstract out as much detail as
>  possible, and to have tests that are as portable as possible.   
> 
> However, as you've noticed, for filebufs in particular, details
> differ  per host. (see the _M_buf_size_pref, to be precise.) Some
> effort has been  expended to make sure the filebuf tests work on
> both solaris, linux, and  cross compilers...   
> 
> I would be interested in suggestions to make things more portable. 

Calls to fpos<>._M_position() can be replaced with a cast to
streamoff.

The use of _M_buf_size_opt should be replaced with calls to setbuf(),
though this is required on every open whereas _M_buf_size_opt applies
across calls to open.

Calls to numpunct<>._M_init() can be replaced by overriding the
virtual protected member functions that return the decimal point,
thousand separator and grouping.

Anthony

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