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Returns the number of elements of a given type within a sequence.
template<
typename Sequence,
typename T
>
typename result_of::count<Sequence, T>::type count(
Sequence const& seq, T const& t);
Table 1.54. Parameters
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
A model of Forward
Sequence, |
The sequence to search |
|
|
Any type |
The type to count |
count(seq, t);
Return type: int
Semantics: Returns the number of elements
of type T and equal to
t in seq.
Linear. At most comparisons.
result_of::size<Sequence>::value
#include <boost/fusion/algorithm/query/count.hpp> #include <boost/fusion/include/count.hpp>
constvector<double,int,int> vec(1.0,2,3); assert(count(vec,2) == 1);