std::partition_point

 

C++

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Espressioni regolari(C++11)

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Multithreading(C++11)

 

Algoritmo libreria

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Non modifica le operazioni di sequenza Original: Non-modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
all_of any_of none_of (C++11) (C++11) (C++11) for_each count count_if mismatch equal	find find_if find_if_not (C++11) find_end find_first_of adjacent_find search search_n
Modifica delle operazioni di sequenza Original: Modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
copy copy_if (C++11) copy_n (C++11) copy_backward move (C++11) move_backward (C++11) fill fill_n transform generate generate_n remove remove_if remove_copy remove_copy_if	replace replace_if replace_copy replace_copy_if swap swap_ranges iter_swap reverse reverse_copy rotate rotate_copy random_shuffle shuffle   (C++11) unique unique_copy
Partizionamento operazioni Original: Partitioning operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_partitioned (C++11) partition partition_copy (C++11)	stable_partition partition_point (C++11)
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is_sorted (C++11) is_sorted_until (C++11) sort	partial_sort partial_sort_copy stable_sort nth_element
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lower_bound upper_bound	binary_search equal_range
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merge inplace_merge includes	set_difference set_intersection set_symmetric_difference set_union
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max max_element min min_element minmax (C++11) minmax_element (C++11)	lexicographical_compare is_permutation (C++11) next_permutation prev_permutation
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qsort	bsearch

 

Defined in header <algorithm>
template<class ForwardIt, class UnaryPredicate > ForwardIt partition_point( ForwardIt first, ForwardIt last, UnaryPredicate p);	(1)	(dal C++11)

Esamina il partizionato (come per std::partition) Fascia [first, last) e individua la fine della prima partizione, che è, il primo elemento che non soddisfa o plast se l'ultima se tutti gli elementi soddisfano p.

Original:

Examines the partitioned (as if by std::partition) range [first, last) and locates the end of the first partition, that is, the first element that does not satisfy p or last if last if all elements satisfy p.

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Parametri

first, last	-	la gamma partizionato di elementi da esaminare Original: the partitioned 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.
p	-	unary predicate which returns ​true per gli elementi che si trovano all'inizio della gamma Original: for the elements found in the beginning of the range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. . The signature of the predicate function should be equivalent to the following:  bool pred(const Type &a); The signature does not need to have const&, but the function must not modify the objects passed to it. The type Type must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to Type. ​
Type requirements
- ForwardIt must meet the requirements of ForwardIterator.

Valore di ritorno

L'iteratore dopo la fine della prima partizione all'interno [first, last)last o se tutti gli elementi soddisfano p.

Original:

The iterator past the end of the first partition within [first, last) or last if all elements satisfy p.

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Complessità

Logaritmica della distanza tra first e last

Original:

Logarithmic in the distance between first and last

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Esempio

#include <algorithm>#include <array>#include <iostream>#include <iterator>   int main(){std::array<int, 9> v ={1, 2, 3, 4, 5, 6, 7, 8, 9};   auto is_even =[](int i){return i %2==0;};std::partition(v.begin(), v.end(), is_even);   auto p = std::partition_point(v.begin(), v.end(), is_even);   std::cout<<"Before partition:\n ";std::copy(v.begin(), p, std::ostream_iterator<int>(std::cout, " "));std::cout<<"\nAfter partition:\n ";std::copy(p, v.end(), std::ostream_iterator<int>(std::cout, " "));}

Output:

Before partition: 8 2 6 4 After partition: 5 3 7 1 9

Vedi anche

is_sorted (C++11)	controlla se un intervallo è ordinata in ordine ascendente 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. (funzione di modello)