[Boost-users] Don't seed() mersenne_twister RNG with 0

From: Benoît SIBAUD (benoit.sibaud_at_[hidden])
Date: 2004-07-22 11:04:09

Hi,

a seed(0) with a mersenne_twister (like mt11213b or mt19937) aborts on 
some assertion (tested on boost 1.31).

boost/random/linear_congruential.hpp:61: 
boost::random::linear_congruential<IntType, a, c, m, 
val>::linear_congruential(IntType) [with IntType = uint32_t, IntType a = 
69069, IntType c = 0, IntType m = 0, IntType val = 0]: Assertion `c || 
x0' failed.

mersenne_twister::seed(x) calls linear_congruential<uint32_t, 69069, 0, 
0, /* unknown */ 0>(x), which asserts(0 || x). So x must be non-zero.

I didn't see it in the doc, but I think it would be a good thing to have 
it written down, or to have mersenne_twister::seed() modified to avoid 
  the assertion.

Regards,

-- 
Benoît Sibaud