[libstdc++/71500] make back reference work with icase

[Tim Shen via libstdc++]

On Mon, Sep 18, 2017 at 10:26 AM, Jonathan Wakely <jwakely@redhat.com> wrote:
>> We need to rewrite this to check the lengths are equal first, and then
>> call the 3-argument version of std::equal.
>>
>> Alternatively, we could move the implementation of the C++14
>> std::equal overloads to __equal and make that available for C++11.
>> I'll try that.
>
>
> Here's a proof of concept patch for that. It's a bit ugly.

Instead of having iterator tags in the interface, we can probe the
random-access-ness inside __equal4/__equal4_p, can't we? It's similar
to the existing "if (_RAIters()) { ... }".

I'd expect the patches to be renaming the current implementations and
adding wrappers, instead of adding new implementations.


-- 
Regards,
Tim Shen