| 
| 
constexpr bool  | playrho::operator!= (const ContactKey &lhs, const ContactKey &rhs) noexcept | 
|   | Inequality operator. 
  | 
|   | 
| 
constexpr bool  | playrho::operator< (const ContactKey &lhs, const ContactKey &rhs) noexcept | 
|   | Less-than operator. 
  | 
|   | 
| 
constexpr bool  | playrho::operator<= (const ContactKey &lhs, const ContactKey &rhs) noexcept | 
|   | Less-than or equal-to operator. 
  | 
|   | 
| 
constexpr bool  | playrho::operator== (const ContactKey &lhs, const ContactKey &rhs) noexcept | 
|   | Equality operator. 
  | 
|   | 
| 
constexpr bool  | playrho::operator> (const ContactKey &lhs, const ContactKey &rhs) noexcept | 
|   | Greater-than operator. 
  | 
|   | 
| 
constexpr bool  | playrho::operator>= (const ContactKey &lhs, const ContactKey &rhs) noexcept | 
|   | Greater-than or equal-to operator. 
  | 
|   | 
Declaration of the ContactKey class and closely related code.