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std::mismatch

Da cppreference.com.
< cpp‎ | algorithm

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C++
 
Algoritmo libreria
Funzioni
Original:
Functions
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Non modifica le operazioni di sequenza
Original:
Non-modifying sequence operations
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all_of
any_of
none_of		(C++11)
(C++11)
(C++11)
for_each
count
count_if
mismatch
equal
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
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Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
Original:
Numeric operations
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Libreria C
Original:
C library
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Elemento definito nell'header <algorithm>
template< class InputIt1, class InputIt2 >

std::pair<InputIt1,InputIt2>
    mismatch( InputIt1 first1,
              InputIt1 last1,

              InputIt2 first2 );
 (1)
template< class InputIt1, class InputIt2, class BinaryPredicate >

std::pair<InputIt1,InputIt2>
    mismatch( InputIt1 first1,
              InputIt1 last1,
              InputIt2 first2,

              BinaryPredicate p );
 (2)
Restituisce la prima coppia di elementi di mismatching da due gruppi: quello definito dalla [first1, last1) e un altro a partire da first2. La prima versione della funzione utilizza operator== per confrontare gli elementi, la seconda versione utilizza il predicato binario dato p.
Original:
Returns the first mismatching pair of elements from two ranges: one defined by [first1, last1) and another starting at first2. The first version of the function uses operator== to compare the elements, the second version uses the given binary predicate p.
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Indice

[modifica] Parametri

first1, last1 -
la prima serie di elementi
Original:
the first range of the elements
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first2 -
all'inizio del secondo intervallo di elementi
Original:
the beginning of the second range of the elements
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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 InputIt1 and InputIt2 can be dereferenced and then implicitly converted to  Type1 and  Type2 respectively.

​

Type requirements
-
InputIt1 must meet the requirements of InputIterator.
-
InputIt2 must meet the requirements of InputIterator.
-
OutputIt must meet the requirements of OutputIterator.

[modifica] Valore di ritorno

std::pair con iteratori alle prime due non equivalenti elementi, o, in mancanza di elementi diversi trovato, coppia con last1 e l'iteratore corrispondente dal secondo intervallo.
Original:
std::pair with iterators to the first two non-equivalent elements, or, if no different elements found, pair with last1 and the corresponding iterator from the second range.
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[modifica] Complessità

Al massimo last1 - first1 applicazioni del predicato
Original:
At most last1 - first1 applications of the predicate
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[modifica] Possibile implementazione

First version 
template<class InputIt1, class InputIt2>
std::pair<InputIt1, InputIt2>
    mismatch(InputIt1 first1, InputIt1 last1, InputIt2 first2)
{
    while (first1 != last1 && *first1 == *first2) {
        ++first1, ++first2;
    }
    return std::make_pair(first1, first2);
}
Second version 
template<class InputIt1, class InputIt2, class BinaryPredicate>
std::pair<InputIt1, InputIt2>
    mismatch(InputIt1 first1, InputIt1 last1, InputIt2 first2, BinaryPredicate p)
{
    while (first1 != last1 && p(*first1, *first2)) {
        ++first1, ++first2;
    }
    return std::make_pair(first1, first2);
}

[modifica] Esempio

Questo programma determina la più lunga sottostringa che si trova contemporaneamente all'inizio della stringa specifico e alla fine di esso, in ordine inverso (possibilmente sovrapposti)
Original:
This program determines the the longest substring that is simultaneously found at the very beginning of the given string and at the very end of it, in reverse order (possibly overlapping)
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#include <iostream>
#include <string>
#include <algorithm>
 
std::string mirror_ends(const std::string& in)
{
    return std::string(in.begin(),
                       std::mismatch(in.begin(), in.end(), in.rbegin()).first);
}
 
int main()
{
    std::cout << mirror_ends("abXYZba") << '\n'
              << mirror_ends("abca") << '\n'
              << mirror_ends("aba") << '\n';
}

Output: 

ab
a
aba

[modifica] Vedi anche
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) [modifica]


(C++11)
trova il primo elemento che soddisfi i criteri specifici
Original:
finds the first element satisfying specific criteria
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(funzione di modello) [modifica]
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) [modifica]
searches for a range of elements
(funzione di modello) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/algorithm/mismatch&oldid=24962"