std::is_sorted_until
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<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <algorithm>
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template< class ForwardIt > ForwardIt is_sorted_until( ForwardIt first, ForwardIt last ); |
(1) | (desde C++11) |
template< class ForwardIt, class Compare > ForwardIt is_sorted_until( ForwardIt first, ForwardIt last, Compare comp ); |
(2) | (desde C++11) |
Examina o
[first, last) gama e encontra o início maior leque de first em que os elementos são classificados em ordem crescente. A primeira versão da função utiliza operator< comparar os elementos, o segundo usa a função de comparação dada comp.Original:
Examines the range
[first, last) and finds the largest range beginning at first in which the elements are sorted in ascending order. The first version of the function uses operator< to compare the elements, the second uses 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.
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Parâmetros
| first, last | - | a gama de elementos para examinar
Original: the 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. |
| 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 |
| Type requirements | ||
-ForwardIt must meet the requirements of ForwardIterator.
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Valor de retorno
O limite superior do início ao maior leque
first em que os elementos são classificados em ordem crescente. Isto é, o último it iterador para que [first, it) gama é classificada.Original:
The upper bound of the largest range beginning at
first in which the elements are sorted in ascending order. That is, the last iterator it for which range [first, it) is sorted.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.
Complexidade
linear, em que a distância entre
first e lastOriginal:
linear in the distance between
first and lastThe 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.
Possível implementação
| First version |
|---|
template<class ForwardIt>
ForwardIt is_sorted_until(ForwardIt first, ForwardIt last)
{
if (first != last) {
ForwardIt next = first;
while (++next != last) {
if (*next < *first)
return next;
first = next;
}
}
return last;
}
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| Second version |
template< class ForwardIt, class Compare >
ForwardIt is_sorted_until(ForwardIt first, ForwardIt last,
Compare comp)
{
if (first != last) {
ForwardIt next = first;
while (++next != last) {
if (comp(*next, *first))
return next;
first = next;
}
}
return last;
|
Exemplo
#include <iostream>
#include <algorithm>
#include <iterator>
#include <random>
int main()
{
std::random_device rd;
std::mt19937 g(rd());
const int N = 6;
int nums[N] = {3, 1, 4, 1, 5, 9};
const int min_sorted_size = 4;
int sorted_size = 0;
do {
std::random_shuffle(nums, nums + N, g);
int *sorted_end = std::is_sorted_until(nums, nums + N);
sorted_size = std::distance(nums, sorted_end);
for (auto i : nums) std::cout << i << ' ';
std::cout << " : " << sorted_size << " initial sorted elements\n";
} while (sorted_size < min_sorted_size);
}
Potencial saída:
4 1 9 5 1 3 : 1 initial sorted elements
4 5 9 3 1 1 : 3 initial sorted elements
9 3 1 4 5 1 : 1 initial sorted elements
1 3 5 4 1 9 : 3 initial sorted elements
5 9 1 1 3 4 : 2 initial sorted elements
4 9 1 5 1 3 : 2 initial sorted elements
1 1 4 9 5 3 : 4 initial sorted elements
Veja também
(C++11) |
Verifica se uma faixa é classificada em ordem crescente Original: checks whether a range is sorted into ascending order The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) |