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std::find, std::find_if, std::find_if_not

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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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find
find_if
find_if_not


(C++11)
find_end
find_first_of
adjacent_find
search
search_n
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 T >
InputIt find( InputIt first, InputIt last, const T& value );
(1)
template< class InputIt, class UnaryPredicate >

InputIt find_if( InputIt first, InputIt last,

                 UnaryPredicate p );
(2)
template< class InputIt, class UnaryPredicate >

InputIt find_if_not( InputIt first, InputIt last,

                     UnaryPredicate q );
(3) (depuis C++11)
Ces fonctions trouver le premier élément de la [first, last) gamme qui répond à des critères spécifiques:
Original:
These functions find the first element in the range [first, last) that satisfies specific criteria:
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1. find recherches pour un élément égal à value
Original:
1. find searches for an element equal to value
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2. find_if recherches pour un élément pour lequel prédicat retourne p true
Original:
2. find_if searches for an element for which predicate p returns true
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3. find_if_not recherches pour élément pour lequel prédicat retourne q false
Original:
3. find_if_not searches for element for which predicate q returns false
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Sommaire

[modifier] Paramètres

first, last -
l'éventail des éléments à examiner
Original:
the range of elements to examine
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value -
valeur à comparer les éléments d'
Original:
value to compare the elements to
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p - unary predicate which returns ​true
pour l'élément requis
Original:
for the required element
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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. ​

q - unary predicate which returns ​false
pour l'élément requis
Original:
for the required element
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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

Itérateur sur le premier élément satisfaisant la condition ou last si aucun élément correspondant n'est trouvé .
Original:
Iterator to the first element satisfying the condition or last if no such element is found.
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[modifier] Complexité

Tout au plus last - first applications du prédicat
Original:
At most last - first applications of the predicate
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[modifier] Mise en œuvre possible

First version
template<class InputIt, class T>
InputIt find(InputIt first, InputIt last, const T& value)
{
    for (; first != last; ++first) {
        if (*first == value) {
            return first;
        }
    }
    return last;
}
Second version
template<class InputIt, class UnaryPredicate>
InputIt find_if(InputIt first, InputIt last, UnaryPredicate p)
{
    for (; first != last; ++first) {
        if (p(*first)) {
            return first;
        }
    }
    return last;
}
Third version
template<class InputIt, class UnaryPredicate>
InputIt find_if_not(InputIt first, InputIt last, UnaryPredicate q)
{
    for (; first != last; ++first) {
        if (!q(*first)) {
            return first;
        }
    }
    return last;
}
Si vous n'avez pas de C + +11, un équivalent de std::find_if_not est d'utiliser std::find_if avec le prédicat nié .
Original:
If you do not have C++11, an equivalent to std::find_if_not is to use std::find_if with the negated predicate.
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template<class InputIt, class UnaryPredicate>
InputIt find_if_not(InputIt first, InputIt last, UnaryPredicate q)
{
    return std::find_if(first, last, std::not1(q));
}

[modifier] Exemple

L'exemple suivant recherche un entier dans un vecteur d'entiers .
Original:
The following example finds an integer in a vector of integers.
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#include <iostream>
#include <algorithm>
#include <vector>
 
int main()
{
    int n1 = 3;
    int n2 = 5;
 
    std::vector<int> v{0, 1, 2, 3, 4};
 
    auto result1 = std::find(v.begin(), v.end(), n1);
    auto result2 = std::find(v.begin(), v.end(), n2);
 
    if (result1 != v.end()) {
        std::cout << "v contains: " << n1 << '\n';
    } else {
        std::cout << "v does not contain: " << n1 << '\n';
    }
 
    if (result2 != v.end()) {
        std::cout << "v contains: " << n2 << '\n';
    } else {
        std::cout << "v does not contain: " << n2 << '\n';
    }
}

Résultat :

v contains: 3
v does not contain: 5

[modifier] Voir aussi

trouve deux identiques (ou une autre relation) des éléments adjacents les uns aux autres
Original:
finds two identical (or some other relationship) items adjacent to each other
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(fonction générique) [edit]
trouve la dernière séquence d'éléments dans une certaine plage
Original:
finds the last sequence of elements in a certain range
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(fonction générique) [edit]
searches for any one of a set of elements
(fonction générique) [edit]
trouve la première position dans laquelle deux plages différentes
Original:
finds the first position where two ranges differ
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(fonction générique) [edit]
recherches pour une série d'éléments
Original:
searches for a range of elements
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(fonction générique) [edit]