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boost::contract::copy_old — Query if old values need to be copied (but not for virtual public functions and public function overrides).
// In header: <boost/contract/old.hpp> bool copy_old();
For example, this function always returns false when both postconditions and exception guarantees are not being checked (see  BOOST_CONTRACT_NO_OLDSBOOST_CONTRACT_OLDOF
See Also:
| Returns: | True if old values need to be copied, false otherwise. |