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std::is_partitioned

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< cpp‎ | algorithm

 
 
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
Original:
Partitioning operations
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is_partitioned (C++11)
partition
partition_copy (C++11)
Opérations de tri (sur les gammes triés)
Original:
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 InputIt, class UnaryPredicate >
bool is_partitioned( InputIt first, InputIt last, UnaryPredicate p );
(depuis C++11)
Retours true si tous les éléments de la gamme [first, last) qui satisfont le prédicat p présenter à tous des éléments qui n'en ont pas. Renvoie également true si [first, last) est vide .
Original:
Returns true if all elements in the range [first, last) that satisfy the predicate p appear before all elements that don't. Also returns true if [first, last) is empty.
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Sommaire

[modifier] Paramètres

first, last -
la plage d'éléments à vérifier
Original:
the range of elements to check
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p - unary predicate which returns ​true
pour les éléments de se trouver dans le début de la plage
Original:
for the elements expected to be 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 InputIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.

[modifier] Retourne la valeur

true si le [first, last) plage est vide ou est partitionné par p. false autrement .
Original:
true if the range [first, last) is empty or is partitioned by p. false otherwise.
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[modifier] Complexité

À la plupart des applications std::distance(first, last) de p .
Original:
At most std::distance(first, last) applications of p.
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[modifier] Mise en œuvre possible

template< class InputIt, class UnaryPredicate >
bool is_partitioned(InputIt first, InputIt last, UnaryPredicate p)
{
    for (; first != last; ++first)
        if (!p(*first))
            break;
    for (; first != last; ++first)
        if (p(*first))
            return false;
    return true;
}

[modifier] Exemple

#include <algorithm>
#include <array>
#include <iostream>
 
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::cout.setf(std::ios_base::boolalpha);
    std::cout << std::is_partitioned(v.begin(), v.end(), is_even) << ' ';
 
    std::partition(v.begin(), v.end(), is_even);
    std::cout << std::is_partitioned(v.begin(), v.end(), is_even) << ' ';
 
    std::reverse(v.begin(), v.end());
    std::cout << std::is_partitioned(v.begin(), v.end(), is_even);
}

Résultat :

false true false

[modifier] Voir aussi

divise une série d'éléments en deux groupes
Original:
divides a range of elements into two groups
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(fonction générique) [edit]
Pour localiser le point de partage d'une gamme partitionné
Original:
locates the partition point of a partitioned range
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(fonction générique) [edit]