Re: [Boost-users] [FunctionTypes] function_arity for non-built-ins

Subject: Re: [Boost-users] [FunctionTypes] function_arity for non-built-ins
From: Larry Evans (cppljevans_at_[hidden])
Date: 2011-01-06 12:32:24

On 01/06/11 08:48, Roman Perepelitsa wrote:
> 2011/1/6 Hossein Haeri <powerprogman_at_[hidden]
> <mailto:powerprogman_at_[hidden]>>
> 
>     Hi Roman,
> 
>     > This is actually possible in most cases. Check this nice article
>     by Eric
>     > Niebler:
>     http://www.boost.org/doc/libs/1_45_0/doc/html/proto/appendices.html#boost_proto.appendices.implementation.function_arity
> 
>     This is beautiful, thanks! :) So, from the description, it seems
>     like this can_be_called guy (or its siblings) is in heavy use for
>     Proto. Does Proto then also port this as a part of its toolbox? Or,
>     is it only for internal use and I'll need to craft my own version of it?
> 
> 
> Unfortunately, there's no official boost implementation of
> can_be_called. You'll have to roll your own version.
> 

Eric's code was used as a basis for a variadic templates implementation
of can_be_called which is available here:

http://svn.boost.org/svn/boost/sandbox/variadic_templates/boost/function_types/can_be_called.hpp

A use is shown here:

http://svn.boost.org/svn/boost/sandbox/variadic_templates/boost/composite_storage/pack/multiple_dispatch/apply_unpack.hpp

  -regards,
  Larry