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std::seed_seq::seed_seq

Da cppreference.com.
< cpp‎ | numeric‎ | random‎ | seed seq

 
 
Numeri libreria
Comuni funzioni matematiche
Virgola mobile ambiente
I numeri complessi
Array numerici
Pseudo-casuale generazione
In fase di compilazione aritmetica razionale (C++11)
Generici operazioni numeriche
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Pseudo-casuale generazione
Motori e adattatori del motore
Original:
Engines and engine adaptors
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linear_congruential_engine(C++11)
mersenne_twister_engine(C++11)
subtract_with_carry_engine(C++11)
discard_block_engine(C++11)
independent_bits_engine(C++11)
shuffle_order_engine(C++11)
Generatori
Original:
Generators
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random_device(C++11)
Distribuzioni
Original:
Distributions
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Distribuzioni uniformi
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Uniform distributions
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uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
Bernoulli distribuzioni
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Bernoulli distributions
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bernoulli_distribution(C++11)
binomial_distribution(C++11)
negative_binomial_distribution(C++11)
geometric_distribution(C++11)
Poisson distribuzioni
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Poisson distributions
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poisson_distribution(C++11)
exponential_distribution(C++11)
gamma_distribution(C++11)
weibull_distribution(C++11)
extreme_value_distribution(C++11)
Distribuzioni normali
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Normal distributions
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normal_distribution(C++11)
lognormal_distribution(C++11)
chi_squared_distribution(C++11)
cauchy_distribution(C++11)
fisher_f_distribution(C++11)
student_t_distribution(C++11)
Distribuzioni di campionamento
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Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Seed Sequenze
Original:
Seed Sequences
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seed_seq(C++11)
Libreria C
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C library
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rand
srand
RAND_MAX
 
std::seed_seq
Membri funzioni
Original:
Member functions
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seed_seq::seed_seq
seed_seq::generate
seed_seq::size
seed_seq::param
 
seed_seq();
(1) (dal C++11)
seed_seq( const seed_seq& ) = delete;
(2) (dal C++11)
template< class InputIt >
seed_seq( InputIt begin, InputIt end );
(3) (dal C++11)
template< class T >
seed_seq( std::initializer_list<T> il );
(4) (dal C++11)
1)
Il costruttore predefinito crea un oggetto con una sequenza std::seed_seq seme iniziale di lunghezza zero.
Original:
The default constructor creates a std::seed_seq object with an initial seed sequence of length zero.
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2)
Il costruttore di copia viene eliminata: std::seed_seq non è copiabile.
Original:
The copy constructor is deleted: std::seed_seq is not copyable.
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3)
Costruisce una std::seed_seq con la sequenza di seme iniziale ottenuto mediante iterazione sulla [begin, end) gamma e la copia dei valori ottenuti dalla dereferenziazione l'iteratore, modulo 232
(cioè i bit inferiori 32 sono copiati)
Original:
Constructs a std::seed_seq with the initial seed sequence obtained by iterating over the range [begin, end) and copying the values obtained by dereferencing the iterator, modulo 232
(that is, the lower 32 bits are copied)
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4)
Equivalente a seed_seq(il.begin(), il.end()). Questo costruttore consente list-inizializzazione.
Original:
Equivalent to seed_seq(il.begin(), il.end()). This constructor enables list-inizializzazione.
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[modifica] Parametri

begin, end -
la sequenza seme iniziale rappresentato da una coppia di iteratori input il cui std::iterator_traits<>::value_type è di tipo intero
Original:
the initial seed sequence represented as a pair of input iterators whose std::iterator_traits<>::value_type is an integer type
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il -
std::initializer_list di oggetti di tipo integer, che fornisce la sequenza iniial seme
Original:
std::initializer_list of objects of integer type, providing the iniial seed sequence
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Type requirements
-
InputIt must meet the requirements of InputIterator.

[modifica] Esempio

#include <random>
#include <sstream>
#include <iterator>
int main()
{
    std::seed_seq s1; // default-constructible
    std::seed_seq s2{1, 2, 3}; // can use list-initialization
    std::seed_seq s3 = {-1, 0, 1}; // another form of list-initialization
    int a[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std::seed_seq s4(a, a + 10); // can use iterators
    std::istringstream buf("1 2 3 4 5"); 
    std::istream_iterator<int> beg(buf), end;
    std::seed_seq s5(beg, end); // even stream input iterators
}