FreeBSD Manual Pages
std::linear...ntial_engine(3) C++ Standard Libarystd::linear...ntial_engine(3) NAME std::linear_congruential_engine - std::linear_congruential_engine Synopsis Defined in header <random> template< class UIntType, UIntType a, (since C++11) UIntType c, UIntType m > class linear_congruential_engine; linear_congruential_engine is a random number engine based on Linear congruential generator (LCG). Template parameters The result type generated by the generator. The effect is undefined if UIntType - this is not one of unsigned short, unsigned int, unsigned long, or unsigned long long. a - the multiplier term c - the increment term m - the modulus term When m is not zero, if a >= m or c >= m is true, the program is ill- formed. Generator properties The size of the states of linear_congruential_engine is 1, each of them consists of a single integer. The actual modulus \(m_0\)m 0 is defined as follows: * If m is not zero, \(m_0\)m 0 is m. * If m is zero, \(m_0\)m 0 is the value of std::numeric_limits<result_type>::max() plus 1 (which means \(m_0\)m 0 need not be representable as result_type). The transition algorithm of linear_congruential_engine is \(TA(x_i) = (a \cdot x_i + c)\mod m_0\)TA(x i) = (ax i+c) mod m 0. The generation algorithm of linear_congruential_engine is \(GA(x_i) = (a \cdot x_i + c)\mod m_0\)GA(x i) = (ax i+c) mod m 0. The pseudo-random number generated with the current state is also the successor state. Predefined specializations The following specializations define the random number engine with two commonly used parameter sets: Defined in header <random> Type Definition std::linear_congruential_engine<std::uint_fast32_t, minstd_rand0 16807, 0, 2147483647> (C++11) Discovered in 1969 by Lewis, Goodman and Miller, adopted as "Minimal standard" in 1988 by Park and Miller std::linear_congruential_engine<std::uint_fast32_t, minstd_rand 48271, 0, 2147483647> (C++11) Newer "Minimum standard", recommended by Park, Miller, and Stockmeyer in 1993 Nested types Type Definition result_type UIntType Data members constexpr UIntType multiplier a [static] (public static member constant) constexpr UIntType increment c [static] (public static member constant) constexpr UIntType modulus m [static] (public static member constant) constexpr UIntType default_seed 1u [static] (public static member constant) Member functions Construction and Seeding constructor constructs the engine (C++11) (public member function) seed sets the current state of the engine (C++11) (public member function) Generation operator() advances the engine's state and returns the gener- ated value (C++11) (public member function) discard advances the engine's state by a specified amount (C++11) (public member function) Characteristics min gets the smallest possible value in the output range [static] (C++11) (public static member function) max gets the largest possible value in the output range [static] (C++11) (public static member function) Non-member functions operator== compares the internal states of two pseudo-random number operator!= engines (C++11) (function) (C++11)(removed in C++20) operator<< performs stream input and output on pseudo-random number operator>> engine (C++11) (function template) Example This section is incomplete Reason: no example Category: * Todo no example http://cppreference.com 2024.06.10 std::linear...ntial_engine(3)
NAME | Synopsis | Template parameters | Member functions | Construction and Seeding | Generation | Characteristics | Non-member functions | Example | Category:
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::linear_congruential_engine&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>