You are correct; it's a transformation from an RNG to a range. I have a version (actually 3 versions) that works with std::random here: https://github.com/KW

You are correct; it's a transformation from an RNG to a range. I have a version (actually 3 versions) that works with std::random here: https://github.com/KWillets/range_generator https://github.com/KWillets/range_generator . That framework is a bit more explicit about the distinction between RNG's and distributions (eg uniform within a range).