Filling a weighted dynamic rank histogram with a dynamic input

[dguest]

I might have missed something, but I can't figure out a clean way to fill a dynamic rank histogram with inputs that also dynamic without using fill and some slightly weird reformatting for the inputs.

Specifically I have something like this

  namespace bh = boost::histogram;
  using dax_t = bh::axis::regular<double>;
  std::vector<dax_t> axes {
    dax_t(1, -0.5, 0.5, "ax0"),
    dax_t(1, -0.5, 0.5, "ax1")
  };
  auto hdyn = bh::make_weighted_histogram(axes);
  // seems we need to do some funny organization to make weighting
  // work with dynamic axes.
  std::vector<std::vector<double>> vals { {0}, {0} };
  hdyn.fill(vals, bh::weight(0.5));

If I try to fill with a std::vector<double> vals {0, 0}; and using hdyn(vals, bh::weight(0.5)); I get a number of arguments != histogram rank exception. Of course calling hdyn(0, 0, bh::weight(0.5)) works fine, but that sort of limits the dynamic part of the dynamic axes.

To be clear, what I have works fine and everything else about this library is amazing. And I don't have much of a use case for dynamic axes anyway, so this is more of a curiosity.