id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
2428	[random] missing member initialization of generator_iterator ctor	Johannes Brunen <JBrunen@…>	No-Maintainer	"I am trying to use boost::generator_iterator with a random number
generator as follows:

---
#include <boost/generator_iterator.hpp>
#include <boost/random/mersenne_twister.hpp>

class my_generator {...};

my_generator gen;

boost::generator_iterator<my_generator> first(&gen);
boost::generator_iterator<my_generator> last;

boost::random::mt19937 rng; rng.seed(first, last);

---

Sadly the default constructor of generator_iterator leaves m_gen
uninitialized and the seed function is trying to compare first
with last.

This yield undefined behavior.

Solution: default ctor member initialization: 

generator_iterator.hpp : line 38

generator_iterator() : m_g(0), m_value(0) {}

"	Bugs	closed	Boost 1.37.0	random	Boost 1.36.0	Problem	wontfix	generator_iterator default ctor	JBrunen@… dwalker07@…