Class slow_float

test/format-impl-test.cc:297–303

}

struct slow_float {
  float value;

  constexpr explicit slow_float(float val = 0) : value(val) {}
  operator float() const { return value; }
  auto operator-() const -> slow_float { return slow_float(-value); }
};

auto format_as(slow_float f) -> float { return f; }