< cpp‎ | numeric‎ | random
Pseudo-random number generation
Uniform random bit generators
Engines and engine adaptors
Non-deterministic generator
Uniform distributions
Bernoulli distributions
Poisson distributions
Normal distributions
Sampling distributions
Seed Sequences
C library
Defined in header <random>

    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 a single integer.

The transition algorithm of the LCG function is x
← (ax
+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(C++11) 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(C++11) 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)
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)
gets the smallest possible value in the output range
(public static member function)
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
the multiplier term (a).
(public static member constant)
constexpr UIntType increment
the increment term (c).
(public static member constant)
constexpr UIntType modulus
the modulus term (m).
(public static member constant)
constexpr UIntType default_seed
the default seed (1).
(public static member constant)