-struct Spring_description
-{
- Real ideal_;
- Real inverse_hooke_;
- Real block_force_;
-
- Real length (Real force) const;
- Spring_description ();
-
- bool is_sane () const;
-
- bool operator> (const Spring_description &s) const
- {
- return block_force_ > s.block_force_;
- }
-
- bool operator< (const Spring_description &s) const
- {
- return block_force_ < s.block_force_;
- }
-};
-