Provided by: libstdc++-10-doc_10.4.0-5ubuntu2_all 
NAME
std::linear_congruential_engine< _UIntType, __a, __c, __m > - A model of a linear
congruential random number generator.
SYNOPSIS
Public Types
typedef _UIntType result_type
Public Member Functions
linear_congruential_engine ()
Constructs a linear_congruential_engine random number generator engine with seed 1.
template<typename _Sseq , typename = _If_seed_seq<_Sseq>> linear_congruential_engine
(_Sseq &__q)
Constructs a linear_congruential_engine random number generator engine seeded from the
seed sequence __q.
linear_congruential_engine (result_type __s)
Constructs a linear_congruential_engine random number generator engine with seed __s.
The default seed value is 1.
void discard (unsigned long long __z)
Discard a sequence of random numbers.
result_type operator() ()
Gets the next random number in the sequence.
template<typename _Sseq > _If_seed_seq< _Sseq > seed (_Sseq &__q)
Reseeds the linear_congruential_engine random number generator engine sequence using
values from the seed sequence __q.
template<typename _Sseq > auto seed (_Sseq &__q) -> _If_seed_seq< _Sseq >
void seed (result_type __s=default_seed)
Reseeds the linear_congruential_engine random number generator engine sequence to the
seed __s.
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 increment
static constexpr result_type modulus
static constexpr result_type multiplier
Friends
template<typename _UIntType1 , _UIntType1 __a1, _UIntType1 __c1, _UIntType1 __m1, typename
_CharT , typename _Traits > std::basic_ostream< _CharT, _Traits > & operator<<
(std::basic_ostream< _CharT, _Traits > &__os, const std::linear_congruential_engine<
_UIntType1, __a1, __c1, __m1 > &__lcr)
Writes the textual representation of the state x(i) of x to __os.
bool operator== (const linear_congruential_engine &__lhs, const linear_congruential_engine
&__rhs)
Compares two linear congruential random number generator objects of the same type for
equality.
template<typename _UIntType1 , _UIntType1 __a1, _UIntType1 __c1, _UIntType1 __m1, typename
_CharT , typename _Traits > std::basic_istream< _CharT, _Traits > & operator>>
(std::basic_istream< _CharT, _Traits > &__is, std::linear_congruential_engine<
_UIntType1, __a1, __c1, __m1 > &__lcr)
Sets the state of the engine by reading its textual representation from __is.
Detailed Description
template<typename _UIntType, _UIntType __a, _UIntType __c, _UIntType __m>
class std::linear_congruential_engine< _UIntType, __a, __c, __m >" A model of a linear
congruential random number generator.
A random number generator ohat produces pseudorandom numbers via linear function:
x_{i+1}tarrow(ax_{i} + c) d ]
The template parameter _UIntType must be an unsigned integral type large enough to store
values up to (__m-1). If the template parameter __m is 0, the modulus __m used is
std::numeric_limits<_UIntType>::max() plus 1. Otherwise, the template parameters __a and
__c must be less than __m.
The size of the state is $1$.
Definition at line 255 of file random.h.
Member Typedef Documentation
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> typedef _UIntType
std::linear_congruential_engine< _UIntType, __a, __c, __m >::result_type
The type of the generated random value.
Definition at line 268 of file random.h.
Constructor & Destructor Documentation
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m>
std::linear_congruential_engine< _UIntType, __a, __c, __m >::linear_congruential_engine ()
[inline]
Constructs a linear_congruential_engine random number generator engine with seed 1.
Definition at line 282 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m>
std::linear_congruential_engine< _UIntType, __a, __c, __m >::linear_congruential_engine
(result_type __s) [inline], [explicit]
Constructs a linear_congruential_engine random number generator engine with seed __s. The
default seed value is 1.
Parameters
__s The initial seed value.
Definition at line 293 of file random.h.
References std::linear_congruential_engine< _UIntType, __a, __c, __m >::seed().
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> template<typename
_Sseq , typename = _If_seed_seq<_Sseq>> std::linear_congruential_engine< _UIntType, __a,
__c, __m >::linear_congruential_engine (_Sseq & __q) [inline], [explicit]
Constructs a linear_congruential_engine random number generator engine seeded from the
seed sequence __q.
Parameters
__q the seed sequence.
Definition at line 304 of file random.h.
References std::linear_congruential_engine< _UIntType, __a, __c, __m >::seed().
Member Function Documentation
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> void
std::linear_congruential_engine< _UIntType, __a, __c, __m >::discard (unsigned long long
__z) [inline]
Discard a sequence of random numbers.
Definition at line 348 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> static constexpr
result_type std::linear_congruential_engine< _UIntType, __a, __c, __m >::max () [inline],
[static], [constexpr]
Gets the largest possible value in the output range.
Definition at line 341 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> static constexpr
result_type std::linear_congruential_engine< _UIntType, __a, __c, __m >::min () [inline],
[static], [constexpr]
Gets the smallest possible value in the output range. The minimum depends on the __c
parameter: if it is zero, the minimum generated must be > 0, otherwise 0 is allowed.
Definition at line 334 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> result_type
std::linear_congruential_engine< _UIntType, __a, __c, __m >::operator() () [inline]
Gets the next random number in the sequence.
Definition at line 358 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> template<typename
_Sseq > _If_seed_seq<_Sseq> std::linear_congruential_engine< _UIntType, __a, __c, __m
>::seed (_Sseq & __q)
Reseeds the linear_congruential_engine random number generator engine sequence using
values from the seed sequence __q.
Parameters
__q the seed sequence.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> template<typename
_Sseq > auto std::linear_congruential_engine< _UIntType, __a, __c, __m >::seed (_Sseq &
__q) -> _If_seed_seq<_Sseq>
" Seeds the LCR engine with a value generated by __q.
Definition at line 132 of file bits/random.tcc.
References std::__lg().
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> void
std::linear_congruential_engine< _UIntType, __a, __c, __m >::seed (result_type __s =
default_seed)
Reseeds the linear_congruential_engine random number generator engine sequence to the seed
__s.
Parameters
__s The new seed.
Seeds the LCR with integral value __s, adjusted so that the ring identity is never a
member of the convergence set.
Definition at line 116 of file bits/random.tcc.
Referenced by std::linear_congruential_engine< _UIntType, __a, __c, __m
>::linear_congruential_engine().
Friends And Related Function Documentation
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> template<typename
_UIntType1 , _UIntType1 __a1, _UIntType1 __c1, _UIntType1 __m1, typename _CharT , typename
_Traits > std::basic_ostream<_CharT, _Traits>& operator<< (std::basic_ostream< _CharT,
_Traits > & __os, const std::linear_congruential_engine< _UIntType1, __a1, __c1, __m1 > &
__lcr) [friend]
Writes the textual representation of the state x(i) of x to __os.
Parameters
__os The output stream.
__lcr A % linear_congruential_engine random number generator.
Returns
__os.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> bool operator==
(const linear_congruential_engine< _UIntType, __a, __c, __m > & __lhs, const
linear_congruential_engine< _UIntType, __a, __c, __m > & __rhs) [friend]
Compares two linear congruential random number generator objects of the same type for
equality.
Parameters
__lhs A linear congruential random number generator object.
__rhs Another linear congruential random number generator object.
Returns
true if the infinite sequences of generated values would be equal, false otherwise.
Definition at line 376 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> template<typename
_UIntType1 , _UIntType1 __a1, _UIntType1 __c1, _UIntType1 __m1, typename _CharT , typename
_Traits > std::basic_istream<_CharT, _Traits>& operator>> (std::basic_istream< _CharT,
_Traits > & __is, std::linear_congruential_engine< _UIntType1, __a1, __c1, __m1 > & __lcr)
[friend]
Sets the state of the engine by reading its textual representation from __is. The textual
representation must have been previously written using an output stream whose imbued
locale and whose type's template specialization arguments _CharT and _Traits were the same
as those of __is.
Parameters
__is The input stream.
__lcr A % linear_congruential_engine random number generator.
Returns
__is.
Member Data Documentation
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> constexpr _UIntType
std::linear_congruential_engine< _UIntType, __a, __c, __m >::increment [static],
[constexpr]
An increment.
Definition at line 273 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> constexpr _UIntType
std::linear_congruential_engine< _UIntType, __a, __c, __m >::modulus [static],
[constexpr]
The modulus.
Definition at line 275 of file random.h.
template<typename _UIntType , _UIntType __a, _UIntType __c, _UIntType __m> constexpr _UIntType
std::linear_congruential_engine< _UIntType, __a, __c, __m >::multiplier [static],
[constexpr]
The multiplier.
Definition at line 271 of file random.h.
Author
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