find_if

Finds the first element within a sequence with a type for which a given MPL Lambda Expression evaluates to boost::mpl::true_.

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<<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working Synopsis ======= ======= ======= ======= ======= ======= >>>>>>> .merge-right.r58559 >>>>>>> .merge-right.r58549 >>>>>>> .merge-right.r58299 >>>>>>> .merge-right.r57337 >>>>>>> .merge-right.r57242 Synopsis >>>>>>> .merge-right.r57125

template<
    typename F,
    typename Sequence
    >
unspecified find_if(Sequence const& seq);

template<
    typename F,
    typename Sequence
    >
unspecified find_if(Sequence& seq);

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Table 1.43. Parameters

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Table 1.43. Parameters

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Table 1.47. Parameters

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Table 1.47. Parameters

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Table 1.47. Parameters

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Table 1.47. Parameters

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Table 1.47. Parameters

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Parameter	Requirement	Description
`seq`	A model of Forward Sequence	The sequence to search
`F`	A unary MPL Lambda Expression	The search predicate

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Expression =======

Expression >>>>>>> .merge-right.r57125 Semantics

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 end(seq) if there is no such element.

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Linear. At most result_of::size<Sequence>::value comparisons.

include <boost/fusion/algorithm/query/find_if.hpp>
include <boost/fusion/include/find_if.hpp>

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const vector<double,int> vec(1.0,2);
assert(*find_if<is_integral<mpl::_> >(vec) == 2);
assert(find_if<is_class<mpl::_> >(vec) == end(vec));