[libstdc++ PATCH] TR1 'function' and 'mem_fn' support

[Chris Jefferson]

Douglas Gregor wrote:

>The attached patch adds support for std::tr1::function and std::tr1::mem_fn to 
>libstdc++. The good news is that it implements the complete specification and 
>passes all of the existing libstdc++ tests (plus the two new tests) on x86 
>Linux. The bad news is that it only passes when using my (unreviewed) patch 
>for making member pointers work properly with function types, posted here:
>
> http://gcc.gnu.org/ml/gcc-patches/2005-01/msg01627.html
>
>It is possible to work around the bugs fixed by that patch, but it's very, 
>very ugly and will require a lot of new code. As it is, any implementation of 
>these facilities requires a huge amount of repetition; in this case, I've 
>chosen to repeatedly include a header file, using macros to generate 
>different code each time. 
>
>In addition to the patch and changelog, I've attached the two new test cases 
>(.cc files). I was unable to find a way to get them into a patch, because 
>they should be placed in a directory that does not yet exist 
>(libstdc++-v3/testsuite/tr1/3_function_objects, e.g.).
>
>Comments appreciated.
>
> Douglas Gregor
>  
>
It all looks reasonable at first glance to me :)

If you enjoy and are good at template-foo, then you might like to note 
that the reference_wrapper, also in tr1/functional, isn't actually 
finished (I wrote the current version when it was just a tiny part of 
the tuple specification. Then it sprouted a bunch of things about 
executing functions, and I got scared off)...

Chris