[boost] Re: [hash] Built in arrays

From: David Abrahams (dave_at_[hidden])
Date: 2005-04-11 02:17:29

"Peter Dimov" <pdimov_at_[hidden]> writes:

> Daniel James wrote:
>> I've just checked in an attempt at supporting built-in arrays in
>> boost::hash. It's not great and I might remove it before Friday. My
>> main problem was that overloading hash_value for both T* and T[Size]
>> causes ambiguity - 

Array types in function parameter lists decay to pointers, so of
course that's ambiguous.  Maybe you mean  

  template <class T, std::size_t N>
  size_t hash_value( T (&x)[N] );

??

>> so I implemented it using partial specialization of call_hash. (If
>> anyone knows how to correctly implement the overload, preferably
>> without SFINAE, let me know, although I'll spend some time looking
>> into it if I can find the time).
>
> Indeed it does! I learn something new every day. ;-)

I'm very confused.  What is "it" and what "does" it do?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com