Re: [boost] [TypeErasure] Forward constructors and binded types

Subject: Re: [boost] [TypeErasure] Forward constructors and binded types
From: Eric Niebler (eric_at_[hidden])
Date: 2012-07-23 13:56:00

On 7/19/2012 1:41 PM, Vicente J. Botet Escriba wrote:
> Le 19/07/12 21:17, Steven Watanabe a écrit :
>> AMDG
>>
>> On 07/18/2012 11:43 AM, Vicente Botet wrote:
>>> Well, I think I have understood how this can work.
>>>
>>> get<1>(t1) returns an any that has a binding
>>> std::vector<double>,int,double
>>> and is this binding that allows to associate _a to std::vector<double>.
>>>
>> Exactly.
>>
>>> I 'd appreciate if the documentation clarifies what these bindings
>>> are, how they are built built and used.
>>
>> You mean like:
>>
>> http://steven_watanabe.users.sourceforge.net/type_erasure/libs/type_erasure/doc/html/boost/type_erasure/binding.html
>>
>> and
>>
>> http://steven_watanabe.users.sourceforge.net/type_erasure/libs/type_erasure/doc/html/boost/type_erasure/binding_of.html
>>
>> As for how it's used, a number of functions
>> take an optional binding argument such as
>> http://steven_watanabe.users.sourceforge.net/type_erasure/libs/type_erasure/doc/html/boost/type_erasure/call.html
>>
> No, this is good, but it is reference documentation. I was thinking more
> as part of the tutorial, what is the concept behind, why it is needed, ...
> IMO the current tutorial hides this major concept of the library.

+1. For the record, I got hung up in the tutorial in exactly the same
place as the OP. Had there been a more extensive description of tuple,
why it's needed, and a who-knows-what-and-when about the different
objects in play -- including the any's returned by get -- it would have
been much easier.

I'd also like to second the call for reference docs on the get function.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com