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

4 Jan 2007

      Johan,

sorry, I have somehow overseen your or misunderstood question.

You can implement smth like this:

template <class T>
struct Type2String
{
    typedef T                   type;
    static const std::string    type_name;
};

const std::string Type2String<T>::type_name(type_id(T).name());

template<class T>
struct pair_gen
{
    typedef mpl::pair< T, Type2String<T> >     type;
};

typedef mpl::map  SomeMap;

With Kind Regards,

Ovanes

On Thu, January 4, 2007 13:47, Ovanes Markarian wrote:
...
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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