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std::search_n

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< cpp‎ | algorithm

 
 
Biblioteca algoritmo
Funções
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Functions
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Não modificar operações de seqüência
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Non-modifying sequence operations
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Modificando operações de seqüência
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Modifying sequence operations
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Particionamento operações
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Partitioning operations
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Operações de classificação (em intervalos ordenados)
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Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
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Binary search operations (on sorted ranges)
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Definir operações (em intervalos ordenados)
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Set operations (on sorted ranges)
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Operações de pilha
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Heap operations
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Mínimo / máximo de operações
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Minimum/maximum operations
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Operações 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)
Pesquisas do [first, last) intervalo para a primeira seqüência de contagem de elementos idênticos, cada um igual ao valor dado valor. A primeira versão utiliza operator== para comparar os elementos, a segunda versão usa o predicado binário 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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Índice

[editar] Parâmetros

first, last -
a gama de elementos para examinar
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the range of elements to examine
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count -
o comprimento da sequência a ser pesquisada
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the length of the sequence to search for
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value -
o valor dos elementos para pesquisar
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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 o início da sequência encontrada no [first, last) gama. Se nenhuma seqüência for encontrado, é retornado 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] Complexidade

Na maioria das aplicações de last - first do predicado.
Original:
At most last - first applications of the predicate.
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[editar] Possível implementação

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] Exemplo

[editar] Veja também

encontra a última sequência de elementos em um determinado intervalo
Original:
finds the last sequence of elements in a certain range
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(modelo de função) [edit]
encontra o primeiro elemento satisfazer critérios específicos
Original:
finds the first element satisfying specific criteria
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(modelo de função) [edit]
searches for a range of elements
(modelo de função) [edit]