close
Varianti

    std::search_n

    Da cppreference.com.
    Image

    Questa pagina è stata tradotta in modo automatico dalla versione in ineglese della wiki usando Google Translate.

    La traduzione potrebbe contenere errori e termini strani. Muovi il puntatore sopra al testo per vedere la versione originale. Puoi aiutarci a correggere gli gli errori. Per ulteriori istruzioni clicca qui.

    Click here for the English version of this page

    <metanoindex/>

     
    C++
     
    Algoritmo libreria
    Funzioni
    Original:
    Functions
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Non modifica le operazioni di sequenza
    Original:
    Non-modifying sequence operations
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Modifica delle operazioni di sequenza
    Original:
    Modifying sequence operations
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Partizionamento operazioni
    Original:
    Partitioning operations
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Ordinamento delle operazioni (su intervalli ordinati)
    Original:
    Sorting operations (on sorted ranges)
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Binarie (le operazioni di ricerca sui campi ordinati)
    Original:
    Binary search operations (on sorted ranges)
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Impostare le operazioni (su intervalli ordinati)
    Original:
    Set operations (on sorted ranges)
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Heap operazioni
    Original:
    Heap operations
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Minimo / massimo le operazioni
    Original:
    Minimum/maximum operations
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Operazioni numeriche
    Original:
    Numeric operations
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    Libreria C
    Original:
    C library
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
     
    <tbody> </tbody>
    Elemento definito nell'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)
    Ricerche la [first, last) gamma per la prima sequenza di conteggio elementi identici, ciascuno pari al valore determinato valore. La prima versione utilizza operator== di confrontare gli elementi, la seconda versione utilizza il predicato binario dato 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.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    Parametri

    first, last -
    la gamma di elementi da esaminare
    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.
    count -
    la lunghezza della sequenza di ricerca
    Original:
    the length of the sequence to search for
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    value -
    il valore degli elementi da ricercare
    Original:
    the value of the elements to search for
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
    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.

    Valore di ritorno

    Iiterator all'inizio della sequenza trovato [first, last) gamma. In assenza di tale sequenza viene trovato, viene restituito last.
    Original:
    Iiterator to the beginning of the found sequence in the range [first, last). If no such sequence is found, last is returned.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    Complessità

    Alla maggior parte delle applicazioni last - first del predicato.
    Original:
    At most last - first applications of the predicate.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    Possibile implementazione

    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;
}

    Esempio

    This section is incomplete

    Vedi anche
    trova l'ultima sequenza di elementi di un certo intervallo
    Original:
    finds the last sequence of elements in a certain range
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    (funzione di modello) [modifica]


    (C++11)
    trova il primo elemento che soddisfi i criteri specifici
    Original:
    finds the first element satisfying specific criteria
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

    (funzione di modello) [modifica]
    		searches for a range of elements
    (funzione di modello) [modifica]