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std::mersenne_twister_engine< _UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f > Class Template Reference
Numerics » Random Number Generation » Random Number Generators

Public Types

typedef _UIntType result_type
 

Public Member Functions

 mersenne_twister_engine (result_type __sd)
 
template<typename _Sseq , typename = _If_seed_seq<_Sseq>>
 mersenne_twister_engine (_Sseq &__q)
 
void discard (unsigned long long __z)
 
result_type operator() ()
 
template<typename _Sseq >
auto seed (_Sseq &__q) -> _If_seed_seq< _Sseq >
 
void seed (result_type __sd=default_seed)
 
template<typename _Sseq >
_If_seed_seq< _Sseq > seed (_Sseq &__q)
 

Static Public Member Functions

static constexpr result_type max ()
 
static constexpr result_type min ()
 

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)
 
bool operator== (const mersenne_twister_engine &__lhs, const mersenne_twister_engine &__rhs)
 
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)
 

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
__wWord size, the number of bits in each element of the state vector.
__nThe degree of recursion.
__mThe period parameter.
__rThe separation point bit index.
__aThe last row of the twist matrix.
__uThe first right-shift tempering matrix parameter.
__dThe first right-shift tempering matrix mask.
__sThe first left-shift tempering matrix parameter.
__bThe first left-shift tempering matrix mask.
__tThe second left-shift tempering matrix parameter.
__cThe second left-shift tempering matrix mask.
__lThe second right-shift tempering matrix parameter.
__fInitialization multiplier.

Definition at line 461 of file random.h.

Member Typedef Documentation

◆ result_type

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.

Definition at line 496 of file random.h.

Constructor & Destructor Documentation

◆ mersenne_twister_engine()

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)
inlineexplicit

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

Parameters
__qthe seed sequence.

Definition at line 530 of file random.h.

Member Function Documentation

◆ discard()

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.

Definition at line 434 of file bits/random.tcc.

◆ max()

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 ( )
inlinestatic

Gets the largest possible value in the output range.

Definition at line 551 of file random.h.

◆ min()

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 ( )
inlinestatic

Gets the smallest possible value in the output range.

Definition at line 544 of file random.h.

Friends And Related Function Documentation

◆ operator<<

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
__osAn output stream.
__xA % mersenne_twister_engine random number generator engine.
Returns
The output stream with the state of __x inserted or in an error state.

◆ operator==

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
__lhsA % mersenne_twister_engine random number generator object.
__rhsAnother % mersenne_twister_engine random number generator object.
Returns
true if the infinite sequences of generated values would be equal, false otherwise.

Definition at line 576 of file random.h.

◆ operator>>

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
__isAn input stream.
__xA % mersenne_twister_engine random number generator engine.
Returns
The input stream with the state of __x extracted or in an error state.
The documentation for this class was generated from the following files: