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Finds the first element within a sequence with a type for which a given
MPL
Lambda Expression evaluates to boost::mpl::true_.
template< typename F, typename Sequence > unspecified find_if(Sequence const& seq); template< typename F, typename Sequence > unspecified find_if(Sequence& seq);
Table 1.53. Parameters
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
A model of Forward Sequence |
The sequence to search |
|
|
A unary MPL Lambda Expression |
The search predicate |
find_if<F>(seq)
Return type: An iterator of the same
iterator category as the iterators of seq.
Semantics: Returns the first element
of seq for which MPL
Lambda Expression F
evaluates to boost::mpl::true_, or
if there is no such element.
end(seq)
Linear. At most comparisons.
result_of::size<Sequence>::value
constvector<double,int> vec(1.0,2); assert(*find_if<is_integral<mpl::_> >(vec) == 2); assert(find_if<is_class<mpl::_> >(vec) ==end(vec));