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<pair_gen<int>::type, pair_gen<double>::type, pair_gen<SomeClass>::type> 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<int,double>, mpl::pair<float, SomeOtherType> > MyMap;
BOOST_MPL_ASSERT(( is_same<mpl::at<MyMap, int>::type, double> ));
You can also map a discriminator value to some type:
typedef mpl::map< mpl::pair<mpl::int_<0>, double>, mpl::pair<mpl::int_<1>, int> > MyMap2;
BOOST_MPL_ASSERT(( is_same<mpl::at<MyMap, mpl::int_<0> >::type, double> )); BOOST_MPL_ASSERT(( is_same<mpl::at<MyMap, mpl::int_<1> >::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.
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