std::all_of, std::any_of, std::none_of
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Defined in header <algorithm>
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template< class InputIt, class UnaryPredicate > bool all_of( InputIt first, InputIt last, UnaryPredicate p ); |
(1) | (desde C++11) |
template< class InputIt, class UnaryPredicate > bool any_of( InputIt first, InputIt last, UnaryPredicate p ); |
(2) | (desde C++11) |
template< class InputIt, class UnaryPredicate > bool none_of( InputIt first, InputIt last, UnaryPredicate p ); |
(3) | (desde C++11) |
Comprueba si predicado unario
2) p
vuelve true para todos los elementos en el rango [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.
You can help to correct and verify the translation. Click here for instructions.
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Comprueba si predicado unario
3) p
vuelve true para al menos un elemento en el rango [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.
Comprueba si predicado unario
p
vuelve true de ningún elemento en el rango [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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Contenido |
[editar] Parámetros
first, last | - | la gama de elementos a examinar
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 | - | unary predicate . 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. |
Type requirements | ||
-InputIt must meet the requirements of InputIterator .
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[editar] Valor de retorno
1)true si predicado unario true retornos para todos los elementos de la gama, false lo contrario. Devoluciones true si el rango está vacío .
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.
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true si predicado unario true rendimientos de al menos un elemento en el intervalo, false lo contrario. Devoluciones false si el rango está vacío .
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.
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true si predicado unario true vuelve a ningún elemento de la gama, false lo contrario. Devoluciones true si el rango está vacío .
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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[editar] Complejidad
A lo sumo
last
- first
aplicaciones del predicadoOriginal:
At most
last
- first
applications of the predicateThe text has been machine-translated via Google Translate.
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[editar] Posible implementación
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; } |
[editar] Ejemplo
#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"; } }
Output:
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