Re: [boost] Use of std::rand() in BGL?

From: Jeremy Siek (jsiek_at_[hidden])
Date: 2001-05-13 09:30:31

Hi Oliver,

Thanks for noticing that. That code predates boost::random, and I forgot
to update it. I've changed those functions to use uniform_int with
whatever generator is passed in. In the graph test programs I'm using
mt19937.

Cheers,
Jeremy

On Fri, 11 May 2001 oliver.frick_at_[hidden] wrote:

oliver> Hello.
oliver> To my surprise I just found that BGL utility funtion 
oliver> random_number() uses the C standard rand() function, which is 
oliver> then used by random_vertex(). Furthermore it processes the 
oliver> random number by applying modulus N, something that is 
oliver> considered numerically dangerous by many. I would suggest 
oliver> that a RNG object from the boost random library could be 
oliver> passed to random_vertex().
oliver> 
oliver> Oliver Frick
oliver> 
oliver> 
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oliver> 

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 Jeremy Siek                        www: http://www.lsc.nd.edu/~jsiek/
 Ph.D. Candidate                  email: jsiek_at_[hidden]
 Univ. of Notre Dame         work phone: [phone]
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