Re: [Boost-users] Mapping from type to value

4 Jan 2007

      Johan,

can you please be more specific? MPL has a map construct mpl::map it can be used like:

typedef mpl::map, mpl::pair >     MyMap;

BOOST_MPL_ASSERT(( is_same::type, double> ));

You can also map a discriminator value to some type:

typedef mpl::map< mpl::pair, double>, mpl::pair, int> > MyMap2;

BOOST_MPL_ASSERT(( is_same >::type, double> ));
BOOST_MPL_ASSERT(( is_same >::type, int> ));

But I do not know if it is what you were looking for.

With Kind Regards,

Ovanes Markarian

On Thu, January 4, 2007 13:11, Johan Torp wrote:
...
What is the best practice for creating a map from a type to a value?
Currently I do it like this:
=====================================
struct SomeMap
{
   template<typename T> static const std::string& LookUp();
};
template <> const std::string& SomeMap::LookUp<int>()
{
  static const std::string s("int");
  return s;
}
=====================================
...but this seems far from optimal.
--
System Developer
TouchTable AB
Tel: +46 (0)31 773 68 12
johan.torp@touchtable.se
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