std::is_partitioned
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Defined in header <algorithm> | ||
template<class InputIt, class UnaryPredicate > bool is_partitioned( InputIt first, InputIt last, UnaryPredicate p ); | (desde C++11) | |
Devoluciones true si todos los elementos de la
[first, last) rango que satisfacen el predicado p comparecer ante todos los elementos que no lo hacen. También regresa true[first, last) si está vacío .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.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.
Contenido |
[editar]Parámetros
| first, last | - | la gama de elementos a comprobar Original: the range of elements to check 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 which returns true para los elementos que se espera encontrar en el comienzo de la gama . Original: for the elements expected to be found in the beginning of the range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. 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. | ||
[editar]Valor de retorno
true si el
[first, last) gama está vacío o se divide por p. false de otra manera .Original:
true if the range
[first, last) is empty or is partitioned by p. false otherwise.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.
[editar]Complejidad
En la mayoría de aplicaciones de
std::distance(first, last)p .Original:
At most
std::distance(first, last) applications of p.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]Posible implementación
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))returnfalse;returntrue;} |
[editar]Ejemplo
#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);}
Output:
false true false
[editar]Ver también
divide una serie de elementos en dos grupos Original: divides a range of elements into two groups The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función de plantilla) | |
(C++11) | locates the partition point of a partitioned range (función de plantilla) |
