olb::descriptors::tag Namespace Reference

Classes
struct	CATEGORY
	Base of all tags describing the category of a descriptor. More...
struct	CUM
struct	DEFAULT
	Implicit default category of normal descriptors. More...
struct	MRT
struct	RTLBM

Typedefs
template<typename BASE , typename FALLBACK , typename... FIELDS>
using	field_with_base
	Returns first item of FIELDS type list that is derived from BASE.

Typedef Documentation

field_with_base

template<typename BASE , typename FALLBACK , typename... FIELDS>

using olb::descriptors::tag::field_with_base

Initial value:

 typename std::conditional<
  std::is_void<typename meta::first_type_with_base<BASE, FIELDS...>::type>::value,
  FALLBACK,
  typename meta::first_type_with_base<BASE, FIELDS...>::type
>::type

Returns first item of FIELDS type list that is derived from BASE.

If such a type list item doesn't exist, FALLBACK is returned.

Definition at line 69 of file descriptorTag.h.