std::seed_seq::generate
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template< class RandomIt > void generate( RandomIt begin, RandomIt end ); |
(desde C++11) | |
Llena el
, sobre la base de los datos originalmente proporcionados en el constructor de esta
[begin, end) rango con valores enteros sin signo i, 0 ≤ i < 232, sobre la base de los datos originalmente proporcionados en el constructor de esta
seed_seq. Los valores producidos se distribuyen sobre toda la gama de 32-bit, incluso si los valores iniciales fueron fuertemente sesgada .Original:
Fills the range
, based on the data originally provided in the constructor of this
[begin, end) with unsigned integer values i, 0 ≤ i < 232, based on the data originally provided in the constructor of this
seed_seq. The produced values are distributed over the entire 32-bit range even if the initial values were strongly biased.The text has been machine-translated via Google Translate.
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El siguiente algoritmo se utiliza (adaptado de la secuencia de inicialización del generador Mersenne Twister por Makoto Matsumoto and Takuji Nishimura, la incorporación de las mejoras realizadas por Mutsuo Saito in 2007)
Original:
The following algorithm is used (adapted from the initialization sequence of the Mersenne Twister generator by Makoto Matsumoto and Takuji Nishimura, incorporating the improvements made by Mutsuo Saito in 2007)
The text has been machine-translated via Google Translate.
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- Si
begin == end, no haga nada. De lo contrario,Original:Ifbegin == end, do nothing. Otherwise,The text has been machine-translated via Google Translate.
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- En primer lugar, configure cada elemento del rango de salida a la
0x8b8b8b8bvalorOriginal:First, set each element of the output range to the value0x8b8b8b8bThe text has been machine-translated via Google Translate.
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- Transformar los elementos de la gama de salida de acuerdo con el siguiente algoritmo:Original:Transform the elements of the output range according to the following algorithm:The text has been machine-translated via Google Translate.
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For k = 0,..., m-1
donde
m=max(s+1, n)Original:
where
m=max(s+1, n)The text has been machine-translated via Google Translate.
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and n=begin-end
and s=v.size()
y
v es el contenedor privada que tiene los valores inicialmente previstos por el constructor de este objeto seed_seq,Original:
and
v is the private container holding the values originally provided by the constructor of this seed_seq object,The text has been machine-translated via Google Translate.
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begin[k+p] += r1begin[k+q] += r2begin[k] = r2,
donde
p=(n-t)/2Original:
where
p=(n-t)/2The text has been machine-translated via Google Translate.
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and q=p+t
and t=(n >= 623) ? 11 : (n >= 68) ? 7 : (n >= 39) ? 5 : (n >= 7) ? 3 : (n - 1) / 2
and r1=1664525 * T(begin[k]^begin[k+p]^begin[k−1])
and T(x) = x ^ (x << 27)
and r2=r1+s if k==0, r2=r1 + k%n + v[k-1] if 0<k<=s, r2=r1 + k%n if k>s.
For k = m,..., m+n-1,
begin[k+p] ^= r3begin[k+q] ^= r4begin[k]=r4
donde
r3 = 1566083941 * T(begin[k]+begin[k+p]+begin[k-1])Original:
where
r3 = 1566083941 * T(begin[k]+begin[k+p]+begin[k-1])The text has been machine-translated via Google Translate.
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and r4=r3 - k%n
donde todos los cálculos se realizan modulo 232
y donde la indexación del rango de salida (
y donde la indexación del rango de salida (
begin[x]) se toma modulo n .Original:
where all calculations are performed modulo 232
and where the indexing of the output range (
and where the indexing of the output range (
begin[x]) is taken modulo n.The text has been machine-translated via Google Translate.
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Parámetros
| begin, end | - | mutables iteradores de acceso aleatorio cuyo
std::iterator_traits<>::value_type es un tipo entero sin signo adecuado para el almacenamiento de valores de 32 bitsOriginal: mutable random-access iterators whose std::iterator_traits<>::value_type is an unsigned integer type suitable for storing 32-bit valuesThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| Requisitos de tipo | ||
-RandomIt debe reunir los requerimientos de RandomAccessIterator.
| ||
Valor de retorno
ninguno, los resultados son escritos en el rango
[begin, end) .Original:
none, the results are written to the
[begin, end) range.The text has been machine-translated via Google Translate.
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Ejemplo
Ejecuta este código
#include <random>
#include <iostream>
int main()
{
std::seed_seq seq({1,2,3,4,5});
std::vector<std::uint32_t> seeds(10);
seq.generate(seeds.begin(), seeds.end());
// Step 1: fill with 0x8b8b8b8b
// seeds = {2341178251, 2341178251, 2341178251, 2341178251, 2341178251,
// 2341178251, 2341178251, 2341178251, 2341178251, 2341178251 }
//
// Step 2:
// n = 10, s = 5, t = 3, p = 3, q = 6, m = 10
//
// First iteration, k = 0; r1 = 1371501266, r2 = 1371501271
//
// seeds = {1371501271, 2341178251, 2341178251, 3712679517, 2341178251,
// 2341178251, 3712679522, 2341178251, 2341178251, 2341178251 }
//
// Iterations from k = 1 to k = 5 (r2 = r1 + k%n + v[k-1])
//
// r1 = 2786190137, 3204727651, 4173325571, 1979226628, 401983366
// r2 = 2786190139, 3204727655, 4173325577, 1979226636, 401983376
//
// seeds = {3350727907, 3188173515, 3204727655, 4173325577, 1979226636,
// 401983376, 3591037797, 2811627722, 1652921976, 2219536532 }
//
// Iterations from k = 6 to k = 9 (r2 = r1 + k%n)
//
// r1 = 2718637909, 1378394210, 2297813071, 1608643617
// r2 = 2718637915, 1378394217, 2297813079, 1608643626
//
// seeds = { 434154821, 1191019290, 3237041891, 1256752498, 4277039715,
// 2010627002, 2718637915, 1378394217, 2297813079, 1608643626 }
//
// Step 3
// iterations from k = 10 to k = 19, using ^= to modify the output
//
// r1 = 1615303485, 3210438310, 893477041, 2884072672, 1918321961,
// r2 = 1615303485, 3210438309, 893477039, 2884072669, 1918321957
//
// seeds = { 303093272, 3210438309, 893477039, 2884072669, 1918321957,
// 1117182731, 1772877958, 2669970405, 3182737656, 4094066935 }
//
// r1 = 423054846, 46783064, 3904109085, 1534123446, 1495905687
// r2 = 423054841, 46783058, 3904109078, 1534123438, 1495905678
//
// seeds = { 4204997637, 4246533866, 1856049002, 1129615051, 690460811,
// 1075771511, 46783058, 3904109078, 1534123438, 1495905678 }
for(std::uint32_t n : seeds)
std::cout << n << '\n';
}
Salida:
4204997637
4246533866
1856049002
1129615051
690460811
1075771511
46783058
3904109078
1534123438
1495905678