Re: [Boost-users] [enable_if] Type choices

25 Mar 2008


      Ovanes Markarian  writes:
...
Type Lib would help if you would like to distinguish only one type or some
...
Good Luck,Ovanes
On 3/24/08, Robert Dailey  wrote:
Thanks, mpl::set is even better, I was going to use mpl::vector, which
special type characteristic. There are some nice traits like: is_same, or
is_base_of, or is_fundamental, or is_scalar, or is_integral etc.
probably wouldn't have worked.I had a feeling the MPL library would be involved,
but I wanted to make sure the type_traits library didn't already have something
in place for this kind of situation. Thanks again!
...
On Mon, Mar 24, 2008 at 3:32 PM, Ovanes Markarian  wrote:
If you only have 2 'valid' types then it's easier to use mpl::or_ instead of
mpl::set.

#include 
#include 
#include 

using namespace boost;
using namespace boost::mpl;

template<class T>
void foo
(
  T,
  typename enable_if
  <
    or_, is_same >
...
::type * = 0
)
{
}
HTH,
Roman Perepelitsa.