boost-users-bounces@lists.boost.org wrote:

Hi

I am using boost/random library in order to create a normal distributed noise. I want to call my my_class::noise() functions several times, but I want to initialize the generator only once. I tried to declare and initialize the generator at the constructor of my_class, but then my_class::noise() doesn't recognized the generator. I wrote it the following way:

my_class::my_class() { boost::mt19937 gen(42u);

}

my_class::noise()

{

boost::normal_distribution<

float> n_d(5, 10); //n_d(mean,stdev)

boost::variate_generator<boost::mt19937&, boost::normal_distribution<float> > normal(gen, n_d);

return normal();

}

I guess I need to declare the generator at the header, and only initialize it at the constructor, but I don't know how to do it.

Thanks for your help. Dvir

hi dvir, this is untested, but should do what you want. class my_class { boost::mt19937 gen_; public: my_class( void ) : gen_(42u) { } void noise( void ) { boost::normal_distribution<float> n_d(5, 10); //n_d(mean,stdev) boost::variate_generator<boost::mt19937&, boost::normal_distribution<float> > normal(gen_, n_d); } }; HTH dave