Vector of variate generators cannot be populated

[fenix.citizen@…]

As in the title, it is impossible to populate a vector of variate generators. I tried to combine Mersenne Twister with uniform_real distribution. The problem appears when using assignment operator. There is no problem when I try to populate STL list with the same objects. The same issue appears for fixed seed. I observed that simple assignment of one variate generator to another one is also impossible. Please find my code snippet below.

	boost::mt19937 rng(static_cast<unsigned int>(time(0)));
	std::vector<boost::uniform_real<> > unifRealDistrVector;
	typedef boost::variate_generator<boost::mt19937&, boost::uniform_real<> > unifRealVarGen;

	std::vector<unifRealVarGen> unifRealVarGenVector;
	//std::list<unifRealVarGen> unifRealVarGenList;
	for (unsigned int iter = 0; iter < 6; iter++) {
		boost::uniform_real<> unifRealDistr(0.0, iter);
		unifRealVarGen varGen(rng, unifRealDistr);
		unifRealVarGenVector.push_back(varGen);
		//unifRealVarGenList.push_back(varGen);
	}

Error message I received is:
/usr/include/boost/random/detail/pass_through_engine.hpp:26:7: error: non-static reference member ‘boost::random::mersenne_twister<unsigned int, 32, 624, 397, 31, 2567483615u, 11, 7, 2636928640u, 15, 4022730752u, 18, 3346425566u>& boost::random::detail::pass_through_engine<boost::random::mersenne_twister<unsigned int, 32, 624, 397, 31, 2567483615u, 11, 7, 2636928640u, 15, 4022730752u, 18, 3346425566u>&>::_rng’, can’t use default assignment operator

I use Cross G++ Compiler 4.6.3 on Ubuntu. I am still learning Boost.Random library. Please correct me if such an operation does not make much sense. Thanks in advance.

[Steven Watanabe]

The problem is that a variate_generator containing a reference is not Assignable. In C++03, the element type of a container must be Assignable (23.1). Use a pointer instead:

variate_generator<mt19937*, uniform_real<> >

Note: The requirement of assignment is relaxed in C++11.

[anonymous]

Thank you for pointing it out. I should have read the variate_generator template description more carefully.

Replying to steven_watanabe:

The problem is that a variate_generator containing a reference is not Assignable. In C++03, the element type of a container must be Assignable (23.1). Use a pointer instead:

variate_generator<mt19937*, uniform_real<> >

Note: The requirement of assignment is relaxed in C++11.