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std::for_each

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< cpp‎ | algorithm

 
 
Bibliothèque d'algorithmes
Fonctions
Original:
Functions
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Non-modification de la séquence des opérations
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Non-modifying sequence operations
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all_of
any_of
none_of
(C++11)
(C++11)
(C++11)
for_each
count
count_if
mismatch
equal
Modification de la séquence des opérations
Original:
Modifying sequence operations
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Des opérations de partitionnement
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Partitioning operations
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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)
Original:
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 UnaryFunction >
UnaryFunction for_each( InputIt first, InputIt last, UnaryFunction f );
Applique la fonction donnée f objet à la suite de déréférencement chaque itération dans le [first, last) plage, dans l'ordre. Si InputIt est un itérateur modifiable, f peut modifier les éléments de la gamme par l'itérateur déréférencé. Si f renvoie un résultat, le résultat est ignoré .
Original:
Applies the given function object f to the result of dereferencing every iterator in the range [first, last), in order. If InputIt is a mutable iterator, f may modify the elements of the range through the dereferenced iterator. If f returns a result, the result is ignored.
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Sommaire

[modifier] Paramètres

first, last -
la gamme d'appliquer la fonction d'
Original:
the range to apply the function to
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f -
l'objet de fonction unaire appliqué
Original:
the unary function object to be applied
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Type requirements
-
InputIt must meet the requirements of InputIterator.
-
UnaryFunction must meet the requirements of MoveConstructible. Does not have to be CopyConstructible

[modifier] Retourne la valeur

f. (avant C++11)
std::move(f). (depuis C++11)

[modifier] Complexité

Exactement last - first applications de f
Original:
Exactly last - first applications of f
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[modifier] Mise en œuvre possible

template<class InputIt, class UnaryFunction>
UnaryFunction for_each(InputIt first, InputIt last, UnaryFunction f)
{
    for (; first != last; ++first) {
        f(*first);
    }
    return f;
}

[modifier] Exemple

L'exemple suivant utilise une fonction lambda pour incrémenter tous les éléments d'un vecteur, puis calcule une somme d'eux:
Original:
The following example uses a fonction lambda to increment all of the elements of a vector and then computes a sum of them:
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#include <vector>
#include <algorithm>
#include <iostream>
 
struct Sum {
    Sum() { sum = 0; }
    void operator()(int n) { sum += n; }
 
    int sum;
};
 
int main()
{
    std::vector<int> nums{3, 4, 2, 9, 15, 267};
 
    std::cout << "before: ";
    for (auto n : nums) {
        std::cout << n << " ";
    }
    std::cout << '\n';
 
    std::for_each(nums.begin(), nums.end(), [](int &n){ n++; });
    Sum s = std::for_each(nums.begin(), nums.end(), Sum());
 
    std::cout << "after:  ";
    for (auto n : nums) {
        std::cout << n << " ";
    }
    std::cout << '\n';
    std::cout << "sum: " << s.sum << '\n';
}

Résultat :

before: 3 4 2 9 15 267
after:  4 5 3 10 16 268
sum: 306

[modifier] Voir aussi

applique une fonction à une série d'éléments
Original:
applies a function to a range of elements
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(fonction générique) [edit]
de gamme pour la boucle
exécute une boucle sur (depuis C++11) gamme
Original:
executes loop over range (depuis C++11)
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[edit]