equal

Interface

template<typename InputIterator1, typename InputIterator2, typename BinaryPredicate>
inline SPROUT_CONSTEXPR bool
equal(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, BinaryPredicate pred);

template<typename InputIterator1, typename InputIterator2>
inline SPROUT_CONSTEXPR bool
equal(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2);

template<typename InputIterator1, typename InputIterator2, typename BinaryPredicate>
inline SPROUT_CONSTEXPR bool
equal(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, BinaryPredicate pred);

template<typename InputIterator1, typename InputIterator2>
inline SPROUT_CONSTEXPR bool
equal(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2);

Remarks

If last2 was not given in the argument list, it denotes first2 + (last1 - first1) below.

Returns

If last1 - first1 != last2 - first2, return false.

Otherwise return true if for every iterator i in the range [first1,last1) the following corresponding conditions hold: *i == *(first2 + (i - first1)), pred(*i, *(first2 + (i - first1))).

Otherwise, returns false.

Examples

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

SPROUT_STATIC_CONSTEXPR auto input1 = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}};
SPROUT_STATIC_CONSTEXPR auto input2 = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}};
SPROUT_STATIC_CONSTEXPR auto result = sprout::equal(begin(input1), end(input1), begin(input2), end(input2));
static_assert(result, "input2 equals to input1.");

Complexity

No applications of the corresponding predicate if InputIterator1 and InputIterator2 meet the requirements of random access iterators and last1 - first1 != last2 - first2.

Otherwise, at most min(last1 - first1, last2 - first2) applications of the corresponding predicate.

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

Header

sprout/algorithm/equal.hpp

Convenience header: sprout/algorithm.hpp