The compiler issued a warning (when compiling TRIQS) that the generation of the implicitly-defined copy assignment operator is deprecated if T has a user-declared destructor or user-declared copy constructor (see https://en.cppreference.com/w/cpp/language/copy_assignment under "Implicitly-defined copy assignment operator").
The compiler issued a warning (when compiling TRIQS) that the generation of the implicitly-defined copy assignment operator is deprecated if T has a user-declared destructor or user-declared copy constructor (see https://en.cppreference.com/w/cpp/language/copy_assignment under "Implicitly-defined copy assignment operator").