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std::iota

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
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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
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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 <numeric>
template< class ForwardIterator, class T >
void iota( ForwardIterator first, ForwardIterator last, T value );
(dal C++11)
Riempie l'[first, last) gamma con valori crescenti in sequenza, a partire da value e ripetutamente la valutazione ++value.
Original:
Fills the range [first, last) with sequentially increasing values, starting with value and repetitively evaluating ++value.
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Equivalente funzionamento:
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Equivalent operation:
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*(d_first)   = value;
*(d_first+1) = ++value;
*(d_first+2) = ++value;
*(d_first+3) = ++value;
...

Indice

[modifica] Parametri

first, last -
l'intervallo di elementi di somma
Original:
the range of elements to sum
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value -
valore iniziale al negozio, l'espressione valore + + deve essere ben formato
Original:
initial value to store, the expression ++value must be well-formed
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[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Complessità

Esattamente last - first incrementi e le assegnazioni.
Original:
Exactly last - first increments and assignments.
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[modifica] Possibile implementazione

template<class ForwardIterator, class T>
void iota(ForwardIterator first, ForwardIterator last, T value)
{
    while(first != last) {
        *first++ = value;
        ++value;
    }
}

[modifica] Esempio

L'esempio seguente applica std::random_shuffle ad un vettore di iteratori ad un std::list std::random_shuffle poiché non può essere applicata a un std::list direttamente. std::iota viene utilizzato per creare il vettore .
Original:
The following example applies std::random_shuffle to a vector of iterators to a std::list since std::random_shuffle cannot be applied to an std::list directly. std::iota is used to create the vector.
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#include <numeric>
#include <algorithm>
#include <list>
#include <vector>
#include <iostream>
 
int main()
{
    std::list<int> l(10);
    std::iota(l.begin(), l.end(), -4);
 
    std::vector<std::list<int>::iterator> v(l.size());
    std::iota(v.begin(), v.end(), l.begin());
 
    std::random_shuffle(v.begin(), v.end());
 
    std::cout << "Contents of the list: ";
    for(auto n: l) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
 
    std::cout << "Contents of the list, shuffled: ";
    for(auto i: v) {
        std::cout << *i << ' ';
    }
    std::cout << '\n';
}

Output:

Contents of the list: -4 -3 -2 -1 0 1 2 3 4 5
Contents of the list, shuffled: 0 -1 3 4 -4 1 -2 -3 2 5

[modifica] Vedi anche

assegna un intervallo di elementi di un certo valore
Original:
assigns a range of elements a certain value
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(funzione di modello) [edit]
salva il risultato di una funzione in un intervallo
Original:
saves the result of a function in a range
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(funzione di modello) [edit]