15#ifndef dealii_cxx17_variant_h
16#define dealii_cxx17_variant_h
22#ifdef DEAL_II_EARLY_DEPRECATIONS
24 "Use the corresponding C++17 header variant instead.")
31 using std::holds_alternative;
#define DEAL_II_NAMESPACE_OPEN
#define DEAL_II_WARNING(desc)
#define DEAL_II_NAMESPACE_CLOSE