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std::partition_point

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Bibliothèque d'algorithmes
Fonctions
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Functions
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Non-modification de la séquence des opérations
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Non-modifying sequence operations
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Modification de la séquence des opérations
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Modifying sequence operations
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Des opérations de partitionnement
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Partitioning operations
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stable_partition
partition_point (C++11)
Opérations de tri (sur les gammes triés)
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Sorting operations (on sorted ranges)
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is_sorted (C++11)
is_sorted_until (C++11)
sort
Opérations binaires de recherche (sur les gammes triés)
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Binary search operations (on sorted ranges)
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Définir les opérations (sur les gammes triés)
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Set operations (on sorted ranges)
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Opérations Heap
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Heap operations
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Minimum / maximum de fonctionnement
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Minimum/maximum operations
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Opérations numériques
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Numeric operations
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Bibliothèque C
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C library
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Defined in header <algorithm>
template< class ForwardIt, class UnaryPredicate >
ForwardIt partition_point( ForwardIt first, ForwardIt last, UnaryPredicate p);
(1) (depuis C++11)
Examine la partitionné (comme par std::partition) Plage [first, last) et localise la fin de la première partition, c'est le premier élément qui ne satisfait pas p ou si last dernière si tous les éléments de satisfaire 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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Sommaire

[modifier] Paramètres

first, last -
la gamme partitionné d'éléments à examiner
Original:
the partitioned range of elements to examine
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p - unary predicate which returns ​true
pour les éléments qui se trouvent au début de la plage
Original:
for the elements found in the beginning of the range
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.

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.

[modifier] Retourne la valeur

L'itérateur delà de la fin de la première partition à l'intérieur ou [first, last) last si tous les éléments de satisfaire 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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[modifier] Complexité

Logarithmique de la distance entre first et last
Original:
Logarithmic in the distance between first and last
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[modifier] Exemple

#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, " "));
}

Résultat :

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

[modifier] Voir aussi

(C++11)
vérifie si une plage est triée dans l'ordre croissant
Original:
checks whether a range is sorted into ascending order
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(fonction générique) [edit]