std::mersenne_twister_engine< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >(3cxx)

NAME¶

std::mersenne_twister_engine< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >

SYNOPSIS¶

#include <random>

Public Types¶

typedef _UIntType result_type

Public Member Functions¶

template<typename _Sseq , typename = _If_seed_seq<_Sseq>> mersenne_twister_engine (_Sseq &__q)
Constructs a mersenne_twister_engine random number generator engine seeded from the seed sequence __q. mersenne_twister_engine (result_type __sd)
void discard (unsigned long long __z)
Discard a sequence of random numbers. result_type operator() ()
template<typename _Sseq > _If_seed_seq< _Sseq > seed (_Sseq &__q)
template<typename _Sseq > auto seed (_Sseq &__q) -> _If_seed_seq< _Sseq >
void seed (result_type __sd=default_seed)

Static Public Member Functions¶

static constexpr result_type max ()
Gets the largest possible value in the output range. static constexpr result_type min ()
Gets the smallest possible value in the output range.

Static Public Attributes¶

static constexpr result_type default_seed
static constexpr result_type initialization_multiplier
static constexpr size_t mask_bits
static constexpr size_t shift_size
static constexpr size_t state_size
static constexpr result_type tempering_b
static constexpr result_type tempering_c
static constexpr result_type tempering_d
static constexpr size_t tempering_l
static constexpr size_t tempering_s
static constexpr size_t tempering_t
static constexpr size_t tempering_u
static constexpr size_t word_size
static constexpr result_type xor_mask

Friends¶

template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > std::basic_ostream< _CharT, _Traits > & operator<< (std::basic_ostream< _CharT, _Traits > &__os, const std::mersenne_twister_engine< _UIntType1, __w1, __n1, __m1, __r1, __a1, __u1, __d1, __s1, __b1, __t1, __c1, __l1, __f1 > &__x)
Inserts the current state of a % mersenne_twister_engine random number generator engine __x into the output stream __os. bool operator== (const mersenne_twister_engine &__lhs, const mersenne_twister_engine &__rhs)
Compares two % mersenne_twister_engine random number generator objects of the same type for equality. template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > std::basic_istream< _CharT, _Traits > & operator>> (std::basic_istream< _CharT, _Traits > &__is, std::mersenne_twister_engine< _UIntType1, __w1, __n1, __m1, __r1, __a1, __u1, __d1, __s1, __b1, __t1, __c1, __l1, __f1 > &__x)
Extracts the current state of a % mersenne_twister_engine random number generator engine __x from the input stream __is.

Detailed Description¶

template<typename _UIntType, size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f>¶

class std::mersenne_twister_engine< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f >"A generalized feedback shift register discrete random number generator.

This algorithm avoids multiplication and division and is designed to be friendly to a pipelined architecture. If the parameters are chosen correctly, this generator will produce numbers with a very long period and fairly good apparent entropy, although still not cryptographically strong.

The best way to use this generator is with the predefined mt19937 class.

This algorithm was originally invented by Makoto Matsumoto and Takuji Nishimura.

Template Parameters

__w Word size, the number of bits in each element of the state vector.
__n The degree of recursion.
__m The period parameter.
__r The separation point bit index.
__a The last row of the twist matrix.
__u The first right-shift tempering matrix parameter.
__d The first right-shift tempering matrix mask.
__s The first left-shift tempering matrix parameter.
__b The first left-shift tempering matrix mask.
__t The second left-shift tempering matrix parameter.
__c The second left-shift tempering matrix mask.
__l The second right-shift tempering matrix parameter.
__f Initialization multiplier.

Member Typedef Documentation¶

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> typedef _UIntType std::mersenne_twister_engine< _UIntType, w, n, m, r, a, u, d, s, b, t, c, l, __f >::result_type¶

The type of the generated random value.

Constructor & Destructor Documentation¶

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> template<typename _Sseq , typename = _If_seed_seq<_Sseq>> std::mersenne_twister_engine< _UIntType, w, n, m, r, a, u, d, s, b, t, c, l, __f >::mersenne_twister_engine (_Sseq & __q) [inline], [explicit]¶

Constructs a mersenne_twister_engine random number generator engine seeded from the seed sequence __q.

Parameters

__q the seed sequence.

Member Function Documentation¶

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> void std::mersenne_twister_engine< _UIntType, w, n, m, r, a, u, d, s, b, t, c, l, f >::discard (unsigned long long z)¶

Discard a sequence of random numbers.

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> static constexpr result_type std::mersenne_twister_engine< _UIntType, w, n, m, r, a, u, d, s, b, t, c, l, __f >::max () [inline], [static], [constexpr]¶

Gets the largest possible value in the output range.

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> static constexpr result_type std::mersenne_twister_engine< _UIntType, w, n, m, r, a, u, d, s, b, t, c, l, __f >::min () [inline], [static], [constexpr]¶

Gets the smallest possible value in the output range.

Friends And Related Symbol Documentation¶

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > std::basic_ostream< _CharT, _Traits > & operator<< (std::basic_ostream< _CharT, _Traits > & __os, const std::mersenne_twister_engine< _UIntType1, w1, n1, m1, r1, a1, u1, d1, s1, b1, t1, c1, l1, f1 > & x) [friend]¶

Inserts the current state of a % mersenne_twister_engine random number generator engine __x into the output stream __os.

Parameters

__os An output stream.
__x A % mersenne_twister_engine random number generator engine.

Returns

The output stream with the state of __x inserted or in an error state.

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> bool operator== (const mersenne_twister_engine< _UIntType, w, n, m, r, a, u, d, s, b, t, c, l, f > & lhs, const mersenne_twister_engine< _UIntType, w, n, m, r, a, u, d, s, b, t, c, l, f > & rhs) [friend]¶

Compares two % mersenne_twister_engine random number generator objects of the same type for equality.

Parameters

__lhs A % mersenne_twister_engine random number generator object.
__rhs Another % mersenne_twister_engine random number generator object.

Returns

true if the infinite sequences of generated values would be equal, false otherwise.

template<typename _UIntType , size_t __w, size_t __n, size_t __m, size_t __r, _UIntType __a, size_t __u, _UIntType __d, size_t __s, _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f> template<typename _UIntType1 , size_t __w1, size_t __n1, size_t __m1, size_t __r1, _UIntType1 __a1, size_t __u1, _UIntType1 __d1, size_t __s1, _UIntType1 __b1, size_t __t1, _UIntType1 __c1, size_t __l1, _UIntType1 __f1, typename _CharT , typename _Traits > std::basic_istream< _CharT, _Traits > & operator>> (std::basic_istream< _CharT, _Traits > & __is, std::mersenne_twister_engine< _UIntType1, w1, n1, m1, r1, a1, u1, d1, s1, b1, t1, c1, l1, f1 > & x) [friend]¶

Extracts the current state of a % mersenne_twister_engine random number generator engine __x from the input stream __is.

Parameters

__is An input stream.
__x A % mersenne_twister_engine random number generator engine.

Returns

The input stream with the state of __x extracted or in an error state.

Author¶

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Source file:	std::mersenne_twister_engine.3cxx.en.gz (from libstdc++-12-doc 12.5.0-6)
Source last updated:	2025-09-12T13:43:35Z
Converted to HTML:	2025-10-22T14:56:36Z