Re: [Boost-users] [random] streamable state of normal_distribution to ostream not accurate

Subject: Re: [Boost-users] [random] streamable state of normal_distribution to ostream not accurate
From: Oei, YC (oei.yungchin_at_[hidden])
Date: 2008-11-06 20:20:07

On Fri, Nov 7, 2008 at 12:44 AM, Dave Steenburgh
<dave.steenburgh_at_[hidden]> wrote:
>>   mt19937 rng;
>>   normal_distribution<> gauss;
>>   variate_generator<mt19937&, normal_distribution<> > var(rng, gauss);
>
> gauss is passed by value, and so var has a copy of it.  This means that when
> you generate values with var, the state of gauss does not change.

Wow, thanks for helping me out there so fast. I completely missed
this, and was especially confused because storing rng did work -
which, I only now realise, is because that is passed by reference
(something I did to share the generator among several
variate_generators I suppose).

Thanks. I'll sleep more sound now :)