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For a sequence seq and
unary function object f,
any returns true if
f returns true for at
least one element of seq.
template<
typename Sequence,
typename F
>
typename result_of::any<Sequence,F>::type any(
Sequence const& seq, F f);
Table 1.50. Parameters
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
A model of Forward
Sequence, |
The sequence to search |
|
|
A unary function object |
The search predicate |
any(seq, f);
Return type: bool
Semantics: Returns true if and only
if f(e)
evaluates to true for some
element e in seq.
Linear. At most comparisons.
result_of::size<Sequence>::value
#include <boost/fusion/algorithm/query/any.hpp> #include <boost/fusion/include/any.hpp>
struct odd { template<typename T> bool operator()(T t) const { return t % 2; } }; ... assert(any(make_vector(1,2), odd())); assert(!any(make_vector(2,4), odd()));