Function DXTC_CONFIG_GETV

template<typename T, class V>
static auto DXTC_CONFIG_GETV(std::string key, T def, const Dune::XT::Common::ValidatorInterface<typename Dune::XT::Common::internal::Typer<T>::type, V> &v) -> int

Reads key from the global Configuration with default value def, validating the result with v.