/** \defgroup senfmpl Low-level template meta programming helpers
*/
+ /** \brief Marker class for empty default values etc.
+
+ This is like Boosts \c boost::mpl::na just an empty class used as template default argument
+ to mark missing arguments
+
+ \note Don't use this as an empty base class. We may add some informative members to this.
+ */
+ struct nil {};
+
/** \brief Return-value type used to implement overload selection
The senf::mpl::rv type is used together with \ref SENF_MPL_RV() to select template
static senf::mpl::rv<0> _SENF_MPL_SLOT_ ## name (_); \
SENF_MPL_SLOT_SET(name,value)
+ /** \brief Define MPL slot initialized to 0
+
+ This is like \ref SENF_MPL_SLOT_DEF() but initializes the slot to the fixed value 0. The
+ advantage over \ref SENF_MPL_SLOT_DEF() is, that this macro may be called from an include
+ file whereas all the other \\c SENF_MPL_SLOT_ macros must always be called from the relevant
+ file.
+ */
+# define SENF_MPL_SLOT_DEF_ZERO(name) \
+ template <class _> \
+ static senf::mpl::rv<0> _SENF_MPL_SLOT_ ## name (_);
+
/** \brief Set MPL slot
\see \ref SENF_MPL_SLOT_DEF()
\ingroup senfmpl