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47 lines
1.4 KiB
ReStructuredText
47 lines
1.4 KiB
ReStructuredText
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.. _sprout-algorithm-one_of:
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###############################################################################
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one_of
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###############################################################################
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Interface
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========================================
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.. sourcecode:: c++
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template<typename InputIterator, typename Predicate>
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inline SPROUT_CONSTEXPR bool
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one_of(InputIterator first, InputIterator last, Predicate pred);
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Returns
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========================================
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*true* if [first,last) is not empty and there is only one iterator i in the range [first,last) such that ``pred(*i)`` is true, and *false* otherwise.
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Examples
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========================================
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.. sourcecode:: c++
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#include <sprout/algorithm/one_of.hpp>
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#include <sprout/array.hpp>
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#include <sprout/container.hpp>
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#include <sprout/functional.hpp>
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using namespace sprout;
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SPROUT_STATIC_CONSTEXPR auto input = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}};
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SPROUT_STATIC_CONSTEXPR auto result = sprout::one_of(begin(input), end(input), bind2nd(greater<>(), 9));
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static_assert(result, "one of input is greater than 9.");
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Complexity
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========================================
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At most ``last - first`` applications of the predicate.
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Recursive function invocations in *O(logN)* (logarithmic) depth.
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Header
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========================================
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``sprout/algorithm/one_of.hpp``
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Convenience header: ``sprout/algorithm.hpp``
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