message: Fixed Windows compile issue 2
diff: @@ -2970,9 +2970,8 @@ public:
  explicit
  PolyFitVisitor(size_type d, weight_func w_func =
  - [](const I &, std::size_t) -> value_type {
  - return (T(1));
  - }) : degree_(d), weights_(w_func) { }
  + [](const I &, std::size_t) -> T { return (1); })
  + : degree_(d), weights_(w_func) { }
  private:
  