| Defined in header <random> | ||
|---|---|---|
template<
class UIntType,
UIntType a,
UIntType c,
UIntType m
> class linear_congruential_engine; | (since C++11) |
linear_congruential_engine is a random number engine based on Linear congruential generator (LCG). A LCG has a state that consists of single integer.
The transition algorithm of the LCG function is x
i+1 ← (ax
i+c) mod m.
The following typedefs define the random number engine with two commonly used parameter sets:
| Defined in header <random> | |
|---|---|
| Type | Definition |
minstd_rand0 | std::linear_congruential_engine<std::uint_fast32_t, 16807, 0, 2147483647>Discovered in 1969 by Lewis, Goodman and Miller, adopted as "Minimal standard" in 1988 by Park and Miller. |
minstd_rand | std::linear_congruential_engine<std::uint_fast32_t, 48271, 0, 2147483647>Newer "Minimum standard", recommended by Park, Miller, and Stockmeyer in 1993. |
Member types
| Member type | Definition |
|---|---|
result_type | The integral type generated by the engine. Results are undefined if this is not an unsigned integral type. |
Member functions
Construction and Seeding | |
| constructs the engine (public member function) | |
| sets the current state of the engine (public member function) | |
Generation | |
| operator()
| advances the engine's state and returns the generated value (public member function) |
| advances the engine's state by a specified amount (public member function) | |
Characteristics | |
| [static] | gets the smallest possible value in the output range (public static member function) |
| [static] | gets the largest possible value in the output range (public static member function) |
Non-member functions
| compares the internal states of two pseudo-random number engines (function template) | |
| performs stream input and output on pseudo-random number engine (function template) |
Member objects
| constexpr UIntType multiplier [static] | the multiplier term (a). (public static member constant) |
| constexpr UIntType increment [static] | the increment term (c). (public static member constant) |
| constexpr UIntType modulus [static] | the modulus term (m). (public static member constant) |
| constexpr UIntType default_seed [static] | the default seed (1). (public static member constant) |
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