std::includes
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Заголовочный файл <algorithm>
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template< class InputIt1, class InputIt2 > bool includes( InputIt1 first1, InputIt1 last1, |
(1) | |
template< class InputIt1, class InputIt2 > bool includes( InputIt1 first1, InputIt1 last1, |
(2) | |
Возврат true, если каждый элемент из отсортированного диапазона
[first2, last2)
находится в диапазоне отсортированы [first, last)
. Также возвращает true если [first2, last2)
пусто. Original:
Returns true if every element from the sorted range
[first2, last2)
is found within the sorted range [first, last)
. Also returns true if [first2, last2)
is empty. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Первая версия ожидает, что оба диапазона должны быть отсортированы с operator<, вторая версия ожидает, что они должны быть отсортированы с заданной функцией сравнения
comp
.Original:
The first version expects both ranges to be sorted with operator<, the second version expects them to be sorted with the given comparison function
comp
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Содержание |
[править] Параметры
first1, last1 | - | отсортированный набор элементов для изучения
Original: the sorted range of elements to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |||||||||
first2, last2 | - | отсортированный набор элементов для поиска
Original: the sorted range of elements to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |||||||||
comp | - | comparison function which returns true if the first argument is less than the second. The signature of the comparison function should be equivalent to the following:
The signature does not need to have const &, but the function must not modify the objects passed to it. | |||||||||
Type requirements | |||||||||||
-InputIt must meet the requirements of InputIterator .
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[править] Возвращаемое значение
true, если каждый элемент из
[first2, last2)
является членом [first, last)
.Original:
true if every element from
[first2, last2)
is a member of [first, last)
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[править] Сложность
В большинстве сравнений 2·(N1+N2-1), где N1 = std::distance(first1, last1) и N2 = std::distance(first2, last2).
Original:
At most 2·(N1+N2-1) comparisons, where N1 = std::distance(first1, last1) and N2 = std::distance(first2, last2).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[править] Возможная реализация
First version |
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template<class InputIt1, class InputIt2> bool includes(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2) { for (; first2 != last2; ++first1) { if (first1 == last1 || *first2 < *first1) return false; if ( !(*first1 < *first2) ) ++first2; } return true; } |
Second version |
template<class InputIt1, class InputIt2> bool includes(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Compare comp) { for (; first2 != last2; ++first1) { if (first1 == last1 || comp(*first2, *first1)) return false; if (!comp(*first1, *first2)) ++first2; } return true; } |
[править] Пример
#include <iostream> #include <algorithm> #include <cctype> int main() { std::vector<char> v1 {'a', 'b', 'c', 'f', 'h', 'x'}; std::vector<char> v2 {'a', 'b', 'c'}; std::vector<char> v3 {'a', 'c'}; std::vector<char> v4 {'g'}; std::vector<char> v5 {'a', 'c', 'g'}; std::vector<char> v6; for (auto i : v1) std::cout << i << ' '; std::cout << "includes:\n"; for (auto i : v2) std::cout << i << ' '; std::cout << ": " << std::includes(v1.begin(), v1.end(), v2.begin(), v2.end()) << '\n'; for (auto i : v3) std::cout << i << ' '; std::cout << ": " << std::includes(v1.begin(), v1.end(), v3.begin(), v3.end()) << '\n'; for (auto i : v4) std::cout << i << ' '; std::cout << ": " << std::includes(v1.begin(), v1.end(), v4.begin(), v4.end()) << '\n'; for (auto i : v5) std::cout << i << ' '; std::cout << ": " << std::includes(v1.begin(), v1.end(), v5.begin(), v5.end()) << '\n'; for (auto i : v6) std::cout << i << ' '; std::cout << ": " << std::includes(v1.begin(), v1.end(), v6.begin(), v6.end()) << '\n'; auto cmp_nocase = [](char a, char b) { return std::tolower(a) < std::tolower(b); } std::vector<char> v7 {'A', 'B', 'C'}; for (auto i : v7) std::cout << i << ' '; std::cout << ": " << std::includes(v1.begin(), v1.end(), v7.begin(), v7.end(), cmp_nocase) << '\n'; }
Вывод:
a b c f h x includes: a b c : 1 a c : 1 g : 0 a c g : 0 A B C : 1
[править] См. также
вычисляет разницу между двумя наборами Original: computes the difference between two sets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (шаблон функции) | |
searches for a range of elements (шаблон функции) |