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A metafunction returning the result type of none.
template< typename Sequence, typename F > struct none { typedef bool type; };
Table 1.48. Parameters
Parameter |
Requirement |
Description |
---|---|---|
Sequence |
A model of Forward Sequence |
Operation's argument |
F |
A model of unary Polymorphic Function Object |
Operation's argument |
result_of::none<Sequence, F>::type
Return type: bool.
Semantics: Returns the return type of none given a sequence of type Sequence and a unary Polymorphic Function Object of type F. The return type is always bool.
Constant.
#include <boost/fusion/algorithm/query/none.hpp> #include <boost/fusion/include/none.hpp>