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std::is_sorted_until

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< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
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Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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Modifica delle operazioni di sequenza
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Modifying sequence operations
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Partizionamento operazioni
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Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
Original:
Sorting operations (on sorted ranges)
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is_sorted(C++11)
is_sorted_until(C++11)
sort
Binarie (le operazioni di ricerca sui campi ordinati)
Original:
Binary search operations (on sorted ranges)
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Impostare le operazioni (su intervalli ordinati)
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Set operations (on sorted ranges)
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Heap operazioni
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Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
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Numeric operations
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Libreria C
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C library
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Defined in header <algorithm>
template< class ForwardIt >
ForwardIt is_sorted_until( ForwardIt first, ForwardIt last );
(1) (dal C++11)
template< class ForwardIt, class Compare >

ForwardIt is_sorted_until( ForwardIt first, ForwardIt last,

                           Compare comp );
(2) (dal C++11)
Esamina l'[first, last) campo e trova l'inizio più vasta gamma di first in cui vengono ordinati gli elementi in ordine crescente. La prima versione della funzione utilizza operator< per confrontare gli elementi, il secondo utilizza la funzione di confronto dato 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.
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Indice

[modifica] Parametri

first, last -
la gamma di elementi da esaminare
Original:
the range of elements to examine
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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:

 bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types Type1 and Type2 must be such that an object of type ForwardIterator can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[modifica] Valore di ritorno

Il limite superiore di inizio più vasta gamma di first in cui vengono ordinati gli elementi in ordine crescente. Cioè, il it iteratore ultimo per il quale è ordinato [first, it) gamma.
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.
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[modifica] Complessità

lineare la distanza tra first e last
Original:
linear in the distance between first and last
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[modifica] Possibile implementazione

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;
}
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;

[modifica] Esempio

#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);
}

Possible output:

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

[modifica] Vedi anche

(C++11)
controlla se un intervallo è ordinata in ordine ascendente
Original:
checks whether a range is sorted into ascending order
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(funzione di modello) [edit]