std::mersenne_twister_engine::mersenne_twister_engine

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Pseudo-random number generation
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Seed Sequences
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C library
 
std::mersenne_twister_engine
 
explicit mersenne_twister_engine( result_type value = default_seed );
 (1) (since C++11)
template< class Sseq >
explicit mersenne_twister_engine( Sseq& s );
 (2) (since C++11)
mersenne_twister_engine( const mersenne_twister_engine& );
 (3) (since C++11)
(implicitly declared)

Constructs the pseudo-random number engine.

1) Constructs the engine and initializes the state (n values X
i of type result_type) as follows: value mod 2w
 is used to initialize X
0 and the rest are initialized iteratively, for i=1-n,...,-1, each X
i is initialized to [f·(X
i-1xor(X
i-1rshift(w-2)))+i mod n] mod 2w
2) Constructs the engine and initializes the state by calling s.generate(a, a+n*k) where a is an array of length n*k and k is ceil(w/32) and then, iteratively for i=-n,...,-1, setting each element of the engine state X
i to (Σk-1
j=0a
k(i+n)+j}·232j
) mod 2w
, and finally if the most significant w-r bits of X
0 are zero, and if all other X
i are zero, replacing X
0 with 2w-1
.

Note: initialization requirements are based on the 2002 version of Mersenne Twister, mt19937ar.c

The overload (2) only participates in overload resolution if Sseq qualifies as a SeedSequence. In particular, it is excluded from the set of candidate functions if Sseq is convertible to result_type.

Parameters

value - seed value to use in the initialization of the internal state
s - seed sequence to use in the initialization of the internal state

Complexity

linear in n (the state size)

See also

 sets the current state of the engine
(public member function)
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