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

6 Jul 2009


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-----Original Message-----
From: Hicham Mouline [mailto:hicham@mouline.org]
Sent: 05 July 2009 15:36
To: Hicham Mouline
Subject: FW: [Boost-users] detect if a type has a size_t member
...
-----Original Message-----
From: boost-users-bounces@lists.boost.org [mailto:boost-users-
bounces@lists.boost.org] On Behalf Of joel
Sent: 03 July 2009 19:04
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] detect if a type has a size_t member
Hicham Mouline wrote:
...
Can I put the macro inside the struct S ? I guess not. I'd write:
HAS_STATIC_MEMBER_NAMED(T, value)
which would return a integral bool or a bool type
it works liek BOOST_MPL_HAS_XXXX so put it where you want to define
a boolean meta-function. It supports ::value and ::type return mpl
boolean.
I'm sorry I can quite get how to use it. I have this:
#include <iostream>
#include 

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

struct T {
};

BOOST_HAS_MEMBER_DATA(S, maxsize)
BOOST_HAS_MEMBER_DATA(T, maxsize)

int main()
{
    if ( boost::introspection::has_member_data_maxsize<T>::value )
    {
        std::cout<<" T has max_size"<