[boost] Re: [iterator + lambda] transform_iterator and lambda expression

From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-04-26 02:23:25

Daniel Wallin wrote:

> David Abrahams wrote:
>> I brought up this issue a few weeks ago.  I was thinking we should be
>> able to write
>>      
>>      rvalue(_1)
>> 
>> or maybe
>> 
>>      cref(_1)
>> 
>> to pass rvalues.
> 
> The problem is that the BPL operator() looks like this:
> 
>    template<class A0>
>    R operator()(A0& a0)
> 
> AFAIK there's no way to insert a const there, other than providing the
> full 2^N overload set.

True. Any attempt to insert some metafunction in argument type, e.g:

   R operator()(const_if_requested<A0>::type a0)

will break template argument deduction.

- Volodya