Hello again, sorry for the many questions to this list right now, I'm just beginning to use boost. This time I have some issues regarding the boost.random usage. I have used it just fine for many examples but there's one tricky bit that I was wondering whether anyone of you knows a solution for. I use a class which keeps the random number generator around as a member variable; this class also has a const matrix. Now in the constructor of the class I do something like: my_class::my_class(args) : rng(seed), matrix(initialise()), ... { ... } Of course, I want to use the rng to initialise the matrix and that's where things fail. I guess, I could use a different rng just to fill the matrix, or make it non-const and fill it in the constructor body. But does anyone know a neat trick to do this in the way proposed? Thank you for any answers, Moritz