std::is_sorted - cppreference.com

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Elemento definito nell'header `<algorithm>`

`template< class ForwardIt > bool is_sorted( ForwardIt first, ForwardIt last );`	(1)	(dal C++11)

`template< class ForwardIt, class Compare > bool is_sorted( ForwardIt first, ForwardIt last, Compare comp );`	(2)	(dal C++11)

Checks if the elements in range [first, last) 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.

Parametri

first, last	-	la gamma di elementi da esaminare 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: `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 `ForwardIt` can be dereferenced and then implicitly converted to both of them.
Type requirements
-`ForwardIt` must meet the requirements of `ForwardIterator`.

Valore di ritorno

true if the elements in the range are sorted in ascending order

Complessità

lineare la distanza tra first e last

Original:

linear in the distance between first and last

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Possibile implementazione

First version
template<class ForwardIt> bool is_sorted(ForwardIt first, ForwardIt last) { return std::is_sorted_until(first, last) == last; }
Second version
template<class ForwardIt, class Compare> bool is_sorted(ForwardIt first, ForwardIt last, Compare comp) { return std::is_sorted_until(first, last, comp) == last; }

First version

template<class ForwardIt>
bool is_sorted(ForwardIt first, ForwardIt last)
{
    return std::is_sorted_until(first, last) == last;
}

Second version

template<class ForwardIt, class Compare>
bool is_sorted(ForwardIt first, ForwardIt last, Compare comp)
{
    return std::is_sorted_until(first, last, comp) == last;
}

Esempio

#include <iostream>
#include <algorithm>

int main() 
{
    const int N = 5;
    int digits[N] = {3, 1, 4, 1, 5};

    for (auto i : digits) std::cout << i << ' ';
    std::cout << ": is_sorted: " << std::is_sorted(digits, digits+N) << '\n';

    std::sort(digits, digits+N);

    for (auto i : digits) std::cout << i << ' ';
    std::cout << ": is_sorted: " << std::is_sorted(digits, digits+N) << '\n';
}

Output:

3 1 4 1 5 : is_sorted: 0
1 1 3 4 5 : is_sorted: 1

Vedi anche


	trova il più grande subrange ordinato Original: finds the largest sorted subrange The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello) [modifica]