NOTICES FOR USERS UPGRADING FROM EARLIER VERSIONS TO 6.x As of 6.0, libpqxx requires C++11 or better. Make sure that your libpqxx is built against the same version of the C++ standard as your own application, or there may be build problems. It may be possible to paper over some mismatches. If your application build fails with errors about `std::experimental::optional`, try defining a macro `PQXX_HIDE_EXP_OPTIONAL` in your application's build. This will suppress support for `std::experimental::optional` even if libpqxx was built to assume that the feature is present.
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