one_of_equal

Interface

template<typename InputIterator, typename T>
inline SPROUT_CONSTEXPR bool
one_of_equal(InputIterator first, InputIterator last, T const& value);

Returns

true if [first,last) is not empty and there is only one iterator i in the range [first,last) such that *i == value is true, and false otherwise.

Examples

#include <sprout/algorithm/one_of_equal.hpp>
#include <sprout/array.hpp>
#include <sprout/container.hpp>
using namespace sprout;

SPROUT_STATIC_CONSTEXPR auto input = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}};
SPROUT_STATIC_CONSTEXPR auto result = sprout::one_of_equal(begin(input), end(input), 1);
static_assert(result, "one of input is equal to 1.");

Complexity

At most last - first applications of the predicate.

Recursive function invocations in O(logN) (logarithmic) depth.

Header

sprout/algorithm/one_of_equal.hpp

Convenience header: sprout/algorithm.hpp