Namespace
Varianti

std::search

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
Original:
Functions
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Non modifica le operazioni di sequenza
Original:
Non-modifying sequence operations
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Modifica delle operazioni di sequenza
Original:
Modifying sequence operations
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Partizionamento operazioni
Original:
Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
Original:
Sorting operations (on sorted ranges)
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Binarie (le operazioni di ricerca sui campi ordinati)
Original:
Binary search operations (on sorted ranges)
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Impostare le operazioni (su intervalli ordinati)
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Set operations (on sorted ranges)
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Heap operazioni
Original:
Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
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Numeric operations
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Libreria C
Original:
C library
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Defined in header <algorithm>
template< class ForwardIt1, class ForwardIt2 >

ForwardIt1 search( ForwardIt1 first, ForwardIt1 last,

                   ForwardIt2 s_first, ForwardIt2 s_last );
(1)
template< class ForwardIt1, class ForwardIt2, class BinaryPredicate >

ForwardIt1 search( ForwardIt1 first, ForwardIt1 last,

                   ForwardIt2 s_first, ForwardIt2 s_last, BinaryPredicate p );
(2)
Cerca la sottosequenza primo [s_first, s_last) elementi nel [first, last - (s_last - s_first)) gamma. La prima versione utilizza operator== di confrontare gli elementi, la seconda versione utilizza il predicato binario dato p.
Original:
Searches for the first subsequence of elements [s_first, s_last) in the range [first, last - (s_last - s_first)). The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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Indice

[modifica] Parametri

first, last -
la gamma di elementi da esaminare
Original:
the range of elements to examine
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s_first, s_last -
la gamma di elementi da cercare
Original:
the range of 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 types  Type1 and  Type2 must be such that objects of types ForwardIt1 and ForwardIt2 can be dereferenced and then implicitly converted to  Type1 and  Type2 respectively.

Type requirements
-
ForwardIt1, ForwardIt2 must meet the requirements of ForwardIterator.

[modifica] Valore di ritorno

Iterator all'inizio [s_first, s_last) sottosequenza primo [first, last - (s_last - s_first)) gamma. Se non sottosequenza non viene trovato, è last returned.
Original:
Iterator to the beginning of first subsequence [s_first, s_last) in the range [first, last - (s_last - s_first)). If no such subsequence is found, last is returned.
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Se [s_first, s_last) è vuota, viene restituito first. (dal C++11)
Original:
If [s_first, s_last) is empty, first is returned. (dal C++11)
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[modifica] Complessità

A confronto la maggior parte S*N dove S = std::distance(s_first, s_last) e N = std::distance(first, last).
Original:
At most S*N comparisons where S = std::distance(s_first, s_last) and N = std::distance(first, last).
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[modifica] Possibile implementazione

First version
template<class ForwardIt1, class ForwardIt2>
ForwardIt1 search(ForwardIt1 first, ForwardIt1 last,
                        ForwardIt2 s_first, ForwardIt2 s_last)
{
    for (; ; ++first) {
        ForwardIt1 it = first;
        for (ForwardIt2 s_it = s_first; ; ++it, ++s_it) {
            if (s_it == s_last) {
                return first;
            }
            if (it == last) {
                return last;
            }
            if (!(*it == *s_it)) {
                break;
            }
        }
    }
}
Second version
template<class ForwardIt1, class ForwardIt2, class BinaryPredicate>
ForwardIt1 search(ForwardIt1 first, ForwardIt1 last,
                        ForwardIt2 s_first, ForwardIt2 s_last, 
                        BinaryPredicate p)
{
    for (; ; ++first) {
        ForwardIt1 it = first;
        for (ForwardIt2 s_it = s_first; ; ++it, ++s_it) {
            if (s_it == s_last) {
                return first;
            }
            if (it == last) {
                return last;
            }
            if (!p(*it, *s_it)) {
                break;
            }
        }
    }
}

[modifica] Esempio

[modifica] Vedi anche

trova l'ultima sequenza di elementi di un certo intervallo
Original:
finds the last sequence of elements in a certain range
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(funzione di modello) [edit]
determina se due serie di elementi sono gli stessi
Original:
determines if two sets of elements are the same
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(funzione di modello) [edit]
trova il primo elemento che soddisfi i criteri specifici
Original:
finds the first element satisfying specific criteria
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(funzione di modello) [edit]
restituisce true se un intervallo è lessicograficamente minore di un altro
Original:
returns true if one range is lexicographically less than another
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(funzione di modello) [edit]
trova la prima posizione in cui due intervalli diversi
Original:
finds the first position where two ranges differ
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(funzione di modello) [edit]
ricerche di un numero di copie consecutive di un elemento in un intervallo
Original:
searches for a number consecutive copies of an element in a range
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(funzione di modello) [edit]