Re: [Boost-users] detect if a type has a size_t member

Subject: Re: [Boost-users] detect if a type has a size_t member
From: Hicham Mouline (hicham_at_[hidden])
Date: 2009-07-29 07:45:32

> -----Original Message-----
> From: boost-users-bounces_at_[hidden] [mailto:boost-users-
> bounces_at_[hidden]] On Behalf Of joel
> Sent: 06 July 2009 14:26
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] detect if a type has a size_t member
> 
> Hicham Mouline wrote:
> > which doesn't build because
> >
> > error C2953: 'boost::introspection::has_member_data_maxsize' : class
> > template has already been defined
> >
> The macro build a template meta-function that you use on your type :
> 
> BOOST_HAS_MEMBER_DATA(size_t, maxsize);
> 
> 
> int main()
> {
>     if ( boost::introspection::has_member_data_maxsize<T>::value )
>     {
>         std::cout<<" T has max_size"<<std::endl;
>     }
>     return 0;
> }
Thank you,

1) struct S {
  static const size_t maxsize =5;
};

2) struct S {
  static size_t maxsize;
};

3) struct S {
  size_t maxsize;
};

Applied to S, the code doesn't compile in 1 and returns false in 2.

Is there a fix that can make it work for 1, 2 and 3 ?
Regards,