Hi, Could anyone explain why some static member functions defined within class definitions are specified with inline keyword? For instance, in boos/serialization/export.hpp template <class Archive, class Serializable> struct export_impl { ... inline static void enable_load(mpl::false_) {} inline static void enable_save(mpl::false_) {} }; AFAIU what the C++ Standard says in chapter "9.3 Member functions", it should be enough to define a member function in its class definition, "in which case it is an inline member function". On the other side, the standard also uses this technique, for instance in example presented in "18.2.1.5 numeric_limits specializations". I'm having problem with catching what's the rationale of using extra inline specifier. I was trying to find answer in the guidelines, but it seems it isn't explained. Best regards, -- Mateusz Loskot, http://mateusz.loskot.net Charter Member of OSGeo, http://osgeo.org