Re: [boost] Any real-world need for static_cast_iterator, const_cast_iterator, dynamic_cast_iterator?

Subject: Re: [boost] Any real-world need for static_cast_iterator, const_cast_iterator, dynamic_cast_iterator?
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2009-02-04 09:41:35

Nigel Stewart wrote:
> 
>> Personally, I've had much use of a custom made match<Type>() adaptor 
>> (using the Boost.RangeEx pipe syntax), that performs a transform with 
>> dynamic_pointer_cast and then filters null results.
> 
>     The idea would be to skip items that dynamic cast to NULL
>     in the operator++() and operator--()?  Except that I'm
>     not sure how to detect the end of the container...  ...
>     sounds interesting...

range | match<Type>()

is just like

range | transformed(dynamic_cast_<Type>(_1)) | filtered(_1)

(assuming my lambdas are correct)