mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-01 01:05:43 +00:00
59 lines
2.3 KiB
ReStructuredText
59 lines
2.3 KiB
ReStructuredText
|
.. _sprout-algorithm-equal_range:
|
||
|
|
###############################################################################
|
||
|
|
equal_range
|
||
|
|
###############################################################################
|
||
|
|
|
||
|
|
Interface
|
||
|
|
========================================
|
||
|
|
.. sourcecode:: c++
|
||
|
|
|
||
|
|
template<typename ForwardIterator, typename T>
|
||
|
|
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
|
||
|
|
equal_range(ForwardIterator first, ForwardIterator last, T const& value);
|
||
|
|
|
||
|
|
template<typename ForwardIterator, typename T, typename Compare>
|
||
|
|
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
|
||
|
|
equal_range(ForwardIterator first, ForwardIterator last, T const& value, Compare comp);
|
||
|
|
|
||
|
|
Requires
|
||
|
|
========================================
|
||
|
|
|
||
|
|
| The elements e of [first,last) shall be partitioned with respect to the expressions ``e < value`` and ``!(value < e)`` or ``comp(e, value)`` and ``!comp(value, e)``.
|
||
|
|
| Also, for all elements e of [first, last), ``e < value`` shall imply ``!(value < e)`` or ``comp(e, value)`` shall imply ``!comp(value, e)``.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
========================================
|
||
|
|
|
||
|
|
| ``make_pair(lower_bound(first, last, value), upper_bound(first, last, value))``
|
||
|
|
| or
|
||
|
|
| ``make_pair(lower_bound(first, last, value, comp), upper_bound(first, last, value, comp))``
|
||
|
|
|
||
|
|
Examples
|
||
|
|
========================================
|
||
|
|
.. sourcecode:: c++
|
||
|
|
|
||
|
|
#include <sprout/algorithm/equal_range.hpp>
|
||
|
|
#include <sprout/algorithm/all_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, 5, 5, 5, 5, 8, 9, 10}};
|
||
|
|
SPROUT_STATIC_CONSTEXPR auto result = sprout::equal_range(begin(input), end(input), 5);
|
||
|
|
static_assert(result.first - begin(input) == 3, "a lower bound position is 3.");
|
||
|
|
static_assert(result.second - begin(input) == 7, "a upper bound position is 7.");
|
||
|
|
static_assert(sprout::all_of_equal(result.first, result.second. 5), "all of result range is equal to 5.");
|
||
|
|
|
||
|
|
Complexity
|
||
|
|
========================================
|
||
|
|
|
||
|
|
| At most ``2 * log2(last - first) + O(1)`` comparisons.
|
||
|
|
| Recursive function invocations in *O(logN)* (logarithmic) depth.
|
||
|
|
|
||
|
|
Header
|
||
|
|
========================================
|
||
|
|
|
||
|
|
| ``sprout/algorithm/equal_range.hpp``
|
||
|
|
| Convenience header: ``sprout/algorithm.hpp``
|
||
|
|
|