On Thu, Mar 7, 2013 at 8:57 PM, Niitsuma Hirotaka < hirotaka.niitsuma@gmail.com> wrote:
There are two type is_foo_type functor For example is_double can be
--------- template<typename T> struct is_double_template : boost::is_same<T,double> {}; ---------
or
--------- struct is_double_runtime { template<typename T> bool operator()(T x){return false;} bool operator()(double x){return true;} }; ---------
Are there any standard naming rule distinguish these functor?
I don't think so, but reasonable alternatives are: - Name them the same thing (union the above definitions). - Name the structs the same, but put them in different namespaces (e.g., mpl and functional). - Name them static_foo and foo (this is the convention used by Boost.Math, I think, for integer functions). is_foo_runtime
is_foo_compiletime ?
The compile-time functor can convert to runtime factor using :
--------- template<typename IsTemplateMplLambda> struct is_templated_type_to_runtime { typedef struct is_templated_type_runtime { template<typename T> bool operator()(T) { return boost::mpl::apply<IsTemplateMplLambda,T>::type::value; } } type; };
Oh, so then what do you need the runtime foo one for? :) - Jeff