¡@
c++ Programming Glossary: null_typeHow can I check if a type is an instantiation of a given class template? [duplicate] http://stackoverflow.com/questions/11251376/how-can-i-check-if-a-type-is-an-instantiation-of-a-given-class-template consider this simple definition of a typelist struct null_type template typename Head typename Tail struct typelist Tail must.. typename Tail struct typelist Tail must be a typelist or null_type typedef Head head typedef Tail tail Now I would like to make.. parameter is always either an instantiation of typelist or null_type . I could use partial specialization to define the template..
How to make generic computations over heterogeneous argument packs of a variadic template function? http://stackoverflow.com/questions/14261183/how-to-make-generic-computations-over-heterogeneous-argument-packs-of-a-variadic underlying type of non homogeneous parameter packs struct null_type Declare primary template template typename... Ts struct homogeneous_type.. is false the underlying type is the fictitious null_type using type typename std conditional isHomogeneous T null_type.. using type typename std conditional isHomogeneous T null_type type Meta function to determine if a parameter pack is homogeneous..
|