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/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-real-debug/include/petscviewertypes.h is in libpetsc3.7.7-dbg 3.7.7+dfsg1-2build5.

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/*
     PetscViewers are objects where other objects can be looked at or stored.
*/

#if !defined(_PETSCVIEWERTYPES_H)
#define _PETSCVIEWERTYPES_H

/*S
     PetscViewer - Abstract PETSc object that helps view (in ASCII, binary, graphically etc)
         other PETSc objects

   Level: beginner

  Concepts: viewing

.seealso:  PetscViewerCreate(), PetscViewerSetType(), PetscViewerType
S*/
typedef struct _p_PetscViewer* PetscViewer;

#endif