/usr/include/dune/common/std/constexpr.hh is in libdune-common-dev 2.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #ifndef DUNE_COMMON_STD_CONSTEXPR_HH
#define DUNE_COMMON_STD_CONSTEXPR_HH
#if HAVE_CONSTEXPR
#define DUNE_CONSTEXPR constexpr
#else // #if HAVE_CONSTEXPR
#define DUNE_CONSTEXPR
#endif // #else // #if HAVE_CONSTEXPR
#endif // #ifndef DUNE_COMMON_STD_CONSTEXPR_HH
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