BOOST_CONTRACT_NO_OLDS — Automatically defined by this library when old value copies are not to be performed.
// In header: <boost/contract/core/config.hpp> BOOST_CONTRACT_NO_OLDS
This macro is not a configuration macro and this library will generate a compile-time error if users try to define it directly. This library will automatically define this macro when users define both
BOOST_CONTRACT_NO_EXCEPTS. Users can manually program
#ifndef statements in their code using this macro to completely disable compilation of old value copies or use the macros defined in
boost/contract_macro.hpp (recommended only for applications where it is truly necessary to completely remove contract code compilation from production code).