id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
10921	Seeding boost::random::mt19937 from a pair of iterators throws an exception	Adam Romanek <romanek.adam@…>	No-Maintainer	"The problem is that when seeding `boost::random::mt19937` from a pair of iterators `std::invalid_argument(""Not enough elements in call to seed"")` exception is thrown.

An isolated test case looks like this:
{{{
#include <boost/array.hpp>
#include <boost/random.hpp>

//typedef boost::random::rand48 generator_t;
typedef boost::random::mt19937 generator_t;

int main() {
  typedef boost::array<int, 3> seed_range_t;
  seed_range_t seed = {1, 2, 3};

  boost::random::seed_seq seed2(seed.begin(), seed.end());
  generator_t generator1(seed2); // works fine

  seed_range_t::iterator begin = seed.begin();
  generator_t generator2(begin, seed.end()); // throws std::invalid_argument(""Not enough elements in call to seed"")
}
}}}

The documentation of the relevant constructor ![1] does not help too much.

Please note that using the same input sequence through `boost::random::seed_seq` works fine. Moreover, the same input sequence passed directly to the constructor of `boost::random::rand48` generator also produces no exceptions.

I'm not sure if `mersenne_twister_engine` needs larger input or the implementation is broken. Please advice.

![1] http://www.boost.org/doc/libs/1_57_0/doc/html/boost/random/mersenne_twister_engine.html#idp93974544-bb"	Bugs	new	To Be Determined	random	Boost 1.57.0	Problem