Libreria random

Ciao a tutti, forse ho trovato il modo di risolvere il problema che avevo con la gaussiana, sto utilizando la libreria <random> ma vengono fuori alcuni errori:

prova.cpp:15: error: ‘default_random_engine’ was not declared in this scope

prova.cpp:15: error: ‘default_random_engine’ was not declared in this scope

questo e` il codice.

// normal_distribution
#include <iostream>
#include <random>
#include <string>

using std::cout;
using std::endl;
using std::string;

int main()
{
  const int nrolls=10000;  // number of experiments
  const int nstars=100;    // maximum number of stars to distribute

  default_random_engine generator;
  normal_distribution<double> distribution(5.0,2.0);

  int p[10]={};

  for (int i=0; i<nrolls; ++i) {
    double number = distribution(generator);
    if ((number>=0.0)&&(number<=10.0)) ++p[int(number)];
  }

  cout << "normal_distribution (5.0,2.0):" << endl;

  for (int i=0; i<10; ++i) {
    cout << i << "-" << (i+1) << ": ";
    cout << string(p[i]*nstars/nrolls,'*') << endl;
  }

  return 0;
}

grazie a tutti.