/usr/include/dune/grid/utility/gridtype.hh is in libdune-grid-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_GRIDTYPE_HH
#define DUNE_GRIDTYPE_HH
/**
* @file
* @author Andreas Dedner
*
* @brief This file can be included directly following config.h to
* test if a grid type was correctly selected.
*
**/
#ifndef HEADERCHECK
// NOGRID is used to specify that no default was set during configure
// If NOGRID and HAVE_GRIDTYPE are both not set then no grid was selected
// and an error is produced
#if defined NOGRID
#if ! HAVE_GRIDTYPE
#error "No grid type selected, use GRIDTYPE=..."
#endif
#else
#if ! HAVE_GRIDTYPE
#error "No grid type selected, typo in GRIDTYPE=...?"
#endif
#endif
#endif // HEADERCHECK
#endif // DUNE_GRIDTYPE_HH
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