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For a sequence seq and
unary function object f,
none returns true if
f returns false for every
element of seq.
template<
typename Sequence,
typename F
>
typename result_of::none<Sequence,F>::type none(
Sequence const& seq, F f);
Table 1.52. Parameters
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
A model of Forward
Sequence, |
The sequence to search |
|
|
A unary function object |
The search predicate |
none(seq, f);
Return type: bool
Semantics: Returns true if and only
if f(e)
evaluates to false for every
element e in seq. Result equivalent to !any(seq, f).
Linear. At most comparisons.
result_of::size<Sequence>::value
#include <boost/fusion/algorithm/query/none.hpp> #include <boost/fusion/include/none.hpp>
struct odd { template<typename T> bool operator()(T t) const { return t % 2; } }; ... assert(none(make_vector(2,4), odd())); assert(!none(make_vector(1,2), odd()));