test for lib.string.cons

[Anton Pevtsov]

Here is the ported test for lib.string.cons and required differences to
the 21.strings.h/cpp files (with changes required for
lib.string.access):
http://people.apache.org/~antonp/stdcxx05102006/

The change log:
2006-05-10  Anton Pevtsov <[EMAIL PROTECTED]>

        * 21.strings.h (SignatureId): Added element for (size_type)
const.
        (MemberId): Added new elements for at, operator [], ctor and
operator=.
        (OverloadId): Added new enum elements for at, operator [], ctor
and 
        operator= overloads.
        * 21.strings.cpp (_rw_setvars): Added support for at, operator
[], ctor 
        and operator= overloads.
        (run_test): Modified according changes in SignatureId.
        * 21.string.cons.cpp: Ported to use simplified test format.

If the test structure is ok, I'll extend the test cases using [EMAIL PROTECTED]
directive.

Here is a question about the ctor exception safety test. Are they needed
when the default allocator is used?
I think that we may test all possible exception safety issues using the
custom allocator.


Thanks,
Anton Pevtsov