56   PetscErrorCode to_string(std::string &buf) const noexcept  in to_string()
59     PetscCallCXX(buf = std::to_string(x) + ", " + std::to_string(y));  in to_string()
86   PetscErrorCode to_string(std::string &buf) const noexcept  in to_string()
89     PetscCallCXX(buf = '<');  in to_string()
91       PetscCallCXX(buf += std::to_string(x[i]));  in to_string()
92       if (i + 1 != x.size()) PetscCallCXX(buf += ", ");  in to_string()
94     PetscCallCXX(buf += ">, <" + y + '>');  in to_string()
658     const auto int_printer = [](int key, std::string &buf) {  in main()  argument
660       PetscCallCXX(buf = std::to_string(key));  in main()
663     const auto double_printer = [](double value, std::string &buf) {  in main()  argument
665       PetscCallCXX(buf = std::to_string(value));  in main()
668     const auto foo_printer = [](const Foo &key, std::string &buf) {  in main()  argument
670       PetscCall(key.to_string(buf));  in main()
673     const auto bar_printer = [](const Bar &value, std::string &buf) {  in main()  argument
675       PetscCall(value.to_string(buf));  in main()
678     const auto pair_printer = [](const std::pair<int, double> &value, std::string &buf) {  in main()  argument
680 … PetscCallCXX(buf = '<' + std::to_string(value.first) + ", " + std::to_string(value.second) + '>');  in main()