Namespace
Varianti

std::minmax

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
Original:
Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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Modifica delle operazioni di sequenza
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Modifying sequence operations
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Partizionamento operazioni
Original:
Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
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Sorting operations (on sorted ranges)
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Binarie (le operazioni di ricerca sui campi ordinati)
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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
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Numeric operations
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Libreria C
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C library
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Defined in header <algorithm>
template< class T >
std::pair<const T&,const T&> minmax( const T& a, const T& b );
(1) (dal C++11)
template< class T, class Compare >
std::pair<const T&,const T&> minmax( const T& a, const T& b, Compare comp );
(2) (dal C++11)
template< class T >
std::pair<T,T> minmax( std::initializer_list<T> ilist);
(3) (dal C++11)
template< class T, class Compare >
std::pair<T,T> minmax( std::initializer_list<T> ilist, Compare comp );
(4) (dal C++11)
1-2)
Restituisce il più piccolo e il maggiore dei due valori.
Original:
Returns the smaller and the greater of the two values.
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3-4)
Restituisce la lista più piccolo e il più grande dei valori di inizializzazione ilist.
Original:
Returns the smallest and the greatest of the values in initializer list ilist.
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I (1,3) versioni utilizzano operator< per confrontare i valori, mentre i (2,4) versioni utilizzare la funzione di confronto dato comp.
Original:
The (1,3) versions use operator< to compare the values, whereas the (2,4) versions use the given comparison function comp.
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Indice

[modifica] Parametri

a, b -
i valori da confrontare
Original:
the values to compare
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ilist -
inizializzatore lista con i valori da confrontare
Original:
initializer list with the values to compare
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comp - comparison function which returns ​true if if a is less than b.

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

 bool cmp(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 an object of type T can be implicitly converted to both of them. ​

Type requirements
-
T must meet the requirements of LessThanComparable. for the overloads (1) and (3)
-
T must meet the requirements of CopyConstructible. for the overloads (3) and (4)

[modifica] Valore di ritorno

1-2)
Restituisce il risultato di std::make_pair(a, b) se a<b o se a è equivalente a b. Restituisce il risultato di std::make_pair(b, a) se b<a.
Original:
Returns the result of std::make_pair(a, b) if a<b or if a is equivalent to b. Returns the result of std::make_pair(b, a) if b<a.
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3-4)
Una coppia con il valore più piccolo ilist come primo elemento e il più grande come secondo. Se alcuni elementi sono equivalenti al più piccolo, l'elemento più a sinistra come viene restituito. Se alcuni elementi sono equivalenti al più grande, l'elemento più a destra come viene restituito.
Original:
A pair with the smallest value in ilist as the first element and the greatest as the second. If several elements are equivalent to the smallest, the leftmost such element is returned. If several elements are equivalent to the largest, the rightmost such element is returned.
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[modifica] Complessità

1-2)
Constant
Original:
Constant
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3-4)
Lineare in ilist.size()
Original:
Linear in ilist.size()
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[modifica] Possibile implementazione

First version
template<class T> 
std::pair<const T&,const T&> minmax(const T& a, const T& b)
{
    return (b < a) ? std::make_pair(b, a)
                   : std::make_pair(a, b);
}
Second version
template<class T, class Compare> 
std::pair<const T&,const T&> minmax(const T& a, const T& b, Compare comp)
{
    return comp(b, a) ? std::make_pair(b, a)
                      : std::make_pair(a, b);
}
Third version
template< class T >
std::pair<T,T> minmax( std::initializer_list ilist)
{
    auto p = std::minmax_element(ilist.begin(), ilist.end());
    return std::make_pair(*p.first, *p.second);
}
Fourth version
template< class T, class Compare >
std::pair<T,T> minmax( std::initializer_list ilist, Compare comp )
{
    auto p = std::minmax_element(ilist.begin(), ilist.end(), comp);
    return std::make_pair(*p.first, *p.second);
}

[modifica] Esempio

#include <algorithm>
#include <iostream>
#include <vector>
#include <cstdlib>
#include <ctime>
 
int main()
{
    std::vector<int> v {3, 1, 4, 1, 5, 9, 2, 6}; 
    std::srand(std::time(0));
    std::pair<int,int> bounds = std::minmax(std::rand() % v.size(),
                                            std::rand() % v.size());
 
    std::cout << "v[" << bounds.first << "," << bounds.second << "]: ";
    for (int i = bounds.first; i < bounds.second; ++i) {
        std::cout << v[i] << ' ';
    }
    std::cout << '\n';
}

Possible output:

v[2,7]: 4 1 5 9 2

[modifica] Vedi anche

restituisce il minore dei due elementi
Original:
returns the smaller of two elements
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(funzione di modello) [edit]
restituisce il più grande dei due elementi
Original:
returns the larger of two elements
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(funzione di modello) [edit]