Re: [boost] [Opaque] Request for interest in Opaque typedefs library emulation

Subject: Re: [boost] [Opaque] Request for interest in Opaque typedefs library emulation
From: Vicente Botet (vicente.botet_at_[hidden])
Date: 2011-07-27 07:37:25

Fernando Pelliccioni wrote:
> 
> On Wed, Jul 20, 2011 at 1:36 PM, Vicente Botet
> <vicente.botet_at_[hidden]>wrote:
> 
> Hi Vicente,
> 
> 
> Can Boost.Opaque supports something like this ... ?
> 
> void test_iostream_concept()
> {
>     typedef ?????????? any_type; //define any_type using boost.opaque with
> meta-mixins
> 
>     typedef std::vector<any_type> ostr_vec;
>     ostr_vec vec;
> 
>     io::stream<sink_x> writer1;               //boost iostreams
>     std::ofstream f1("test.txt");
> 
>     vec.push_back( any_type(writer1) );
>     vec.push_back( any_type(std::cout) );
>     vec.push_back( any_type(f1) );
> 
>     ostr_vec::const_iterator it = vec.begin();
>     ostr_vec::const_iterator end = vec.end();
> 
>     for ( ; it != end; ++it )
>     {
>         //(*it) << "hello " << "world!";        //(1) compile-time error.
> any_type do not support operator<<
>     }
> }
> 
> 

Hi,

Boost.Opaque is intended to define types that different from others. What I
think you are looking for is provided by Boost.TypeErasure (from Steave
Watanave).

I pretend to adapt Boost.Opaque to the design of Boost.TypeErasure (as I
missed some features (, as multiple overloadings) that can not be provided
with the current design).

Best,
Vicente

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