Method lower

include/boost/histogram/axis/types.hpp:237–240

Returns lower edge of bin.

  /// Returns lower edge of bin.
  value_type lower(int i) const noexcept {
    const value_type z = value_type(i) / base_type::size();
    return z * perimeter_ + phase_;
  }

  bin_type operator[](int idx) const noexcept { return bin_type(idx, *this); }