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std::mersen...ister_engine(3) C++ Standard Libarystd::mersen...ister_engine(3) NAME std::mersenne_twister_engine::mersenne_twister_engine - std::mersenne_twister_engine::mersenne_twister_engine Synopsis mersenne_twister_engine() : (1) (since C++11) mersenne_twister_engine(default_seed) {} explicit mersenne_twister_engine( result_type value ); (2) (since C++11) template< class Sseq > (3) (since C++11) explicit mersenne_twister_engine( Sseq& s ); mersenne_twister_engine( const mersenne_twister_engine& ); (4) (since C++11) (im- plicitly declared) Constructs the pseudo-random number engine. 1) Default constructor. Seeds the engine with default_seed. 2) 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 3) Constructs the engine and initializes the state by calling s.gen- erate(a, a+n*k) where a is an array of length n*k and k is ceil(w/32) and then, it- eratively for i=-n,...,-1, setting each element of the engine state X i to (k-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 (3) only participates in overload resolution if Sseq qualifies as a SeedSequence. In particular, it is excluded from the set of candi- date 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) Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior P0935R0 C++11 default constructor was explicit made implicit See also seed sets the current state of the engine (C++11) (public member function) http://cppreference.com 2022.07.31 std::mersen...ister_engine(3)
NAME | Synopsis | Parameters | Complexity | See also
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