std::all_of, std::any_of, std::none_of
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Déclaré dans l'en-tête <algorithm>
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template< class InputIt, class UnaryPredicate > bool all_of( InputIt first, InputIt last, UnaryPredicate p ); |
(1) | (depuis C++11) |
template< class InputIt, class UnaryPredicate > bool any_of( InputIt first, InputIt last, UnaryPredicate p ); |
(2) | (depuis C++11) |
template< class InputIt, class UnaryPredicate > bool none_of( InputIt first, InputIt last, UnaryPredicate p ); |
(3) | (depuis C++11) |
Vérifie si prédicat unaire
2) p
retours true pour tous les éléments de la gamme [first, last)
.Original:
Checks if unary predicate
p
returns true for all elements in the range [first, last)
.The text has been machine-translated via Google Translate.
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Vérifie si prédicat unaire
3) p
retours true pour au moins un élément dans la gamme [first, last)
.Original:
Checks if unary predicate
p
returns true for at least one element in the range [first, last)
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Vérifie si prédicat unaire
p
retours true pour aucun des éléments de la gamme [first, last)
.Original:
Checks if unary predicate
p
returns true for no elements in the range [first, last)
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Sommaire |
[modifier] Paramètres
first, last | - | l'éventail des éléments à examiner
Original: the 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 | - | prédicat unéaire . L'expression p(v) doit pouvoir être convertie à bool pour tout argument |
Type requirements | ||
-InputIt must meet the requirements of InputIterator .
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[modifier] Retourne la valeur
1)true si prédicat unaire renvoie true pour tous les éléments de la gamme, false autrement. Retours true si la plage est vide .
2) Original:
true if unary predicate returns true for all elements in the range, false otherwise. Returns true if the range is empty.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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true si prédicat unaire renvoie true pendant au moins un élément de la gamme, false autrement. Retours false si la plage est vide .
3) Original:
true if unary predicate returns true for at least one element in the range, false otherwise. Returns false if the range is empty.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
true si prédicat unaire renvoie true pour aucun des éléments de la gamme, false autrement. Retours true si la plage est vide .
Original:
true if unary predicate returns true for no elements in the range, false otherwise. Returns true if the range is empty.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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[modifier] Complexité
Tout au plus
last
- first
applications du prédicatOriginal:
At most
last
- first
applications of the predicateThe text has been machine-translated via Google Translate.
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[modifier] Mise en œuvre possible
First version |
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template< class InputIt, class UnaryPredicate > bool all_of(InputIt first, InputIt last, UnaryPredicate p) { for (; first != last; ++first) { if (!p(*first)) return false; } return true; } |
Second version |
template< class InputIt, class UnaryPredicate > bool any_of(InputIt first, InputIt last, UnaryPredicate p) { for (; first != last; ++first) { if (p(*first)) return true; } return false; } |
Third version |
template< class InputIt, class UnaryPredicate > bool none_of(InputIt first, InputIt last, UnaryPredicate p) { for (; first != last; ++first) { if (p(*first)) return false; } return true; } |
[modifier] Exemple
#include <vector> #include <numeric> #include <algorithm> #include <iterator> #include <iostream> #include <functional> int main() { std::vector<int> v(10, 2); std::partial_sum(v.cbegin(), v.cend(), v.begin()); std::cout << "Among the numbers: "; std::copy(v.cbegin(), v.cend(), std::ostream_iterator<int>(std::cout, " ")); std::cout << '\n'; if (std::all_of(v.cbegin(), v.cend(), [](int i){ return i % 2 == 0; })) { std::cout << "All numbers are even\n"; } if (std::none_of(v.cbegin(), v.cend(), std::bind(std::modulus<int>(), std::placeholders::_1, 2))) { std::cout << "None of them are odd\n"; } struct DivisibleBy { const int d; DivisibleBy(int n) : d(n) {} bool operator()(int n) const { return n % d == 0; } }; if (std::any_of(v.cbegin(), v.cend(), DivisibleBy(7))) { std::cout << "At least one number is divisible by 7\n"; } }
Résultat :
Among the numbers: 2 4 6 8 10 12 14 16 18 20 All numbers are even None of them are odd At least one number is divisible by 7