Re: [Boost-users] [BGL] reset of the random number generator in the sorted_erdos_renyi_iterator

Subject: Re: [Boost-users] [BGL] reset of the random number generator in the sorted_erdos_renyi_iterator
From: Jeremiah Willcock (jewillco_at_[hidden])
Date: 2009-10-08 12:19:32

On Thu, 8 Oct 2009, Marti Cuquet wrote:

> Hi,
>
> I noticed that when generating several graphs with the
> sorted_erdos_renyi_iterator with the same random generator all of them
> happen to be the same. Looking at erdos_renyi_generator.hpp I see that
> there is a reset in the generator.
>
> This does not happens in the normal (unsorted) erdos_renyi_iterator
> since the generator is passed by reference in the constructor.
>
> I'm still not confortable with the BGL and the random libraries, but I
> might say that it is better to pass the random generator by reference.
> Is there a special reason for not doing so?

The generator needs to be wrapped in the constructor (even though it is 
passed by reference) in order to get a uniform_01 interface from it. 
Please check r56651 to see if it addresses your issue; I changed the 
construction of the wrapper to use a pointer to the generator instead. 
Thank you for noticing this issue.

-- Jeremiah Willcock