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std::search_n

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C++
 
Algoritmo biblioteca
Funciones
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Functions
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Para no modificar la secuencia de las operaciones
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Non-modifying sequence operations
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Modificación de la secuencia de operaciones
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Modifying sequence operations
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Particionamiento operaciones
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Partitioning operations
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Clasificación de las operaciones (en rangos ordenados)
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Sorting operations (on sorted ranges)
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Las operaciones binarias de búsqueda (en rangos ordenados)
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Binary search operations (on sorted ranges)
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Conjunto de operaciones (en rangos ordenados)
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Set operations (on sorted ranges)
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Operaciones del montón
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Heap operations
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Mínimo / máximo de operaciones
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Minimum/maximum operations
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Operaciones numéricas
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Numeric operations
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C biblioteca
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C library
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Defined in header <algorithm>
template< class ForwardIt, class Size, class T >
ForwardIt1 search_n( ForwardIt first, ForwardIt last, Size count, const T& value );
 (1)
template< class ForwardIt, class Size, class T, class BinaryPredicate >

ForwardIt1 search_n( ForwardIt first, ForwardIt last, Size count, const T& value,

                     BinaryPredicate p );
 (2)
Búsquedas [first, last) el intervalo para la primera secuencia de recuento de elementos idénticos, cada uno igual al valor determinado valor. La primera versión utiliza operator== para comparar los elementos, la segunda versión utiliza el predicado binario dado p .
Original:
Searches the range [first, last) for the first sequence of count identical elements, each equal to the given value value. The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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Contenido

[editar] Parámetros

first, last -
la gama de elementos a examinar
Original:
the range of elements to examine
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count -
la longitud de la secuencia a buscar
Original:
the length of the sequence to search for
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value -
el valor de los elementos a buscar
Original:
the value of the elements to search for
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p - binary predicate which returns ​true if the elements should be treated as equal.

The signature of the predicate function should be equivalent to the following:

 bool pred(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type  Type1 must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to  Type1. The type  Type2 must be such that an object of type T can be implicitly converted to  Type2.

​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[editar] Valor de retorno

Iiterator para el comienzo de la secuencia que se encuentra en el rango de [first, last). Si tal secuencia no se encuentra, se devuelve last .
Original:
Iiterator to the beginning of the found sequence in the range [first, last). If no such sequence is found, last is returned.
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[editar] Complejidad

En la mayoría de aplicaciones de last - first el predicado .
Original:
At most last - first applications of the predicate.
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[editar] Posible implementación

First version 
template<class ForwardIt, class Size, class T>
ForwardIt1 search_n(ForwardIt first, ForwardIt last,
                          Size count, const T& value)
{
    Size curr_count = 0;
    ForwardIt result, t_last = first;
    std::advance(t_last, std::distance(first, last) - count + 1);
 
    for (; first != t_last; first++) {
        curr_count = 0;
        result = first;
        while (*first == value) {
            curr_count++;
            if (curr_count == count) {
                return result;
            }
            ++first;
        }
    }
    return last;
}
Second version 
template<class ForwardIt, class Size, class T, class BinaryPredicate>
ForwardIt1 search_n(ForwardIt first, ForwardIt last,
                          Size count, const T& value, BinaryPredicate p)
{
    Size curr_count = 0;
    ForwardIt result, t_last = first;
    std::advance(t_last, std::distance(first, last) - count + 1);
 
    for (; first != t_last; first++) {
        curr_count = 0;
        result = first;
        while (p(*first == value)) {
            curr_count++;
            if (curr_count == count) {
                return result;
            }
            ++first;
        }
    }
    return last;
}

[editar] Ejemplo

This section is incomplete

[editar] Ver también
encuentra la última secuencia de elementos en un cierto rango
Original:
finds the last sequence of elements in a certain range
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(función de plantilla) [edit]


(C++11)
encuentra el primer elemento que satisfaga los criterios específicos
Original:
finds the first element satisfying specific criteria
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(función de plantilla) [edit]
searches for a range of elements
(función de plantilla) [edit]
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/algorithm/search_n&oldid=26406»