How to initialize boost::random::discrete_distribution using double[];

Question

I would like to initialize boost::random::discrete_distribution with a double[] like this:

boost::random::discrete_distribution<>* distribution(double* _distr)
{
    return new boost::random::discrete_distribution<>(_distr);
}

I know I can use vector or statically sized table but is there a way to overcome that without rewriting my _distr?

a +1 to you for having the biggest Gravatar I've ever seen. I didn't know it was possible to do something like that. — Michael Dautermann, Mar 29 '12 at 21:40

score 1 · Accepted Answer · answered Mar 29 '12 at 21:53

discrete_distribution<> cannot take a plain double* argument because it would have no way to know how long the array is.

Instead it takes an iterator range, but you'll have to specify the number of elements in your array:

boost::random::discrete_distribution<>* distribution(double const* distr,
                                                     std::ptrdiff_t count)
{
    return new boost::random::discrete_distribution<>(distr, distr + count);
}

As usual, this is made quite clear in the documentation.

Thank you! That's the answer I was hoping for! – Emsi Mar 29 '12 at 21:56 — Emsi, Mar 29 '12 at 21:56

How to initialize boost::random::discrete_distribution using double[];

1 Answers1