xref: /petsc/include/petscviewer.h (revision 3050cee28ff83b093d983d7c5197e87b438ca09b)
1 /*
2      PetscViewers are objects where other objects can be looked at or stored.
3 */
4 
5 #if !defined(__PETSCVIEWER_H)
6 #define __PETSCVIEWER_H
7 
8 #if defined(PETSC_USE_EXTERN_CXX) && defined(__cplusplus)
9 extern "C" {
10 #endif
11 
12 /*S
13      PetscViewer - Abstract PETSc object that helps view (in ASCII, binary, graphically etc)
14          other PETSc objects
15 
16    Level: beginner
17 
18   Concepts: viewing
19 
20 .seealso:  PetscViewerCreate(), PetscViewerSetType(), PetscViewerType
21 S*/
22 typedef struct _p_PetscViewer* PetscViewer;
23 
24 #if defined(PETSC_USE_EXTERN_CXX) && defined(__cplusplus)
25 }
26 #endif
27 
28 #include "petsc.h"
29 
30 #if defined(PETSC_USE_EXTERN_CXX) && defined(__cplusplus)
31 extern "C" {
32 #endif
33 
34 extern PETSC_DLLEXPORT PetscCookie PETSC_VIEWER_COOKIE;
35 
36 #if defined(PETSC_USE_EXTERN_CXX) && defined(__cplusplus)
37 }
38 #endif
39 
40 
41 /*
42     petsc.h must be included AFTER the definition of PetscViewer for ADIC to
43    process correctly.
44 */
45 PETSC_EXTERN_CXX_BEGIN
46 /*E
47     PetscViewerType - String with the name of a PETSc PETScViewer
48 
49    Level: beginner
50 
51 .seealso: PetscViewerSetType(), PetscViewer
52 E*/
53 #define PetscViewerType const char*
54 #define PETSC_VIEWER_SOCKET       "socket"
55 #define PETSC_VIEWER_ASCII        "ascii"
56 #define PETSC_VIEWER_BINARY       "binary"
57 #define PETSC_VIEWER_STRING       "string"
58 #define PETSC_VIEWER_DRAW         "draw"
59 #define PETSC_VIEWER_VU           "vu"
60 #define PETSC_VIEWER_MATHEMATICA  "mathematica"
61 #define PETSC_VIEWER_SILO         "silo"
62 #define PETSC_VIEWER_NETCDF       "netcdf"
63 #define PETSC_VIEWER_HDF4         "hdf4"
64 #define PETSC_VIEWER_MATLAB       "matlab"
65 
66 extern PetscFList PetscViewerList;
67 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerRegisterAll(const char *);
68 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerRegisterDestroy(void);
69 
70 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerRegister(const char*,const char*,const char*,PetscErrorCode (*)(PetscViewer));
71 
72 /*MC
73    PetscViewerRegisterDynamic - Adds a method to the Krylov subspace solver package.
74 
75    Synopsis:
76    PetscErrorCode PetscViewerRegisterDynamic(char *name_solver,char *path,char *name_create,PetscErrorCode (*routine_create)(PetscViewer))
77 
78    Not Collective
79 
80    Input Parameters:
81 +  name_solver - name of a new user-defined solver
82 .  path - path (either absolute or relative) the library containing this solver
83 .  name_create - name of routine to create method context
84 -  routine_create - routine to create method context
85 
86    Level: developer
87 
88    Notes:
89    PetscViewerRegisterDynamic() may be called multiple times to add several user-defined solvers.
90 
91    If dynamic libraries are used, then the fourth input argument (routine_create)
92    is ignored.
93 
94    Sample usage:
95 .vb
96    PetscViewerRegisterDynamic("my_viewer_type",/home/username/my_lib/lib/libO/solaris/mylib.a,
97                "MyViewerCreate",MyViewerCreate);
98 .ve
99 
100    Then, your solver can be chosen with the procedural interface via
101 $     PetscViewerSetType(ksp,"my_viewer_type")
102    or at runtime via the option
103 $     -viewer_type my_viewer_type
104 
105   Concepts: registering^Viewers
106 
107 .seealso: PetscViewerRegisterAll(), PetscViewerRegisterDestroy()
108 M*/
109 #if defined(PETSC_USE_DYNAMIC_LIBRARIES)
110 #define PetscViewerRegisterDynamic(a,b,c,d) PetscViewerRegister(a,b,c,0)
111 #else
112 #define PetscViewerRegisterDynamic(a,b,c,d) PetscViewerRegister(a,b,c,d)
113 #endif
114 
115 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerCreate(MPI_Comm,PetscViewer*);
116 PetscPolymorphicSubroutine(PetscViewerCreate,(PetscViewer *v),(PETSC_COMM_SELF,v))
117 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSetFromOptions(PetscViewer);
118 
119 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIOpen(MPI_Comm,const char[],PetscViewer*);
120 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryCreate(MPI_Comm,PetscViewer*);
121 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryOpen(MPI_Comm,const char[],PetscFileMode,PetscViewer*);
122 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSocketOpen(MPI_Comm,const char[],int,PetscViewer*);
123 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerStringOpen(MPI_Comm,char[],PetscInt,PetscViewer*);
124 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerDrawOpen(MPI_Comm,const char[],const char[],int,int,int,int,PetscViewer*);
125 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMathematicaOpen(MPI_Comm, int, const char[], const char[], PetscViewer *);
126 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSiloOpen(MPI_Comm, const char[], PetscViewer *);
127 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMatlabOpen(MPI_Comm,const char[],PetscFileMode,PetscViewer*);
128 
129 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerGetType(PetscViewer,PetscViewerType*);
130 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSetType(PetscViewer,PetscViewerType);
131 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerDestroy(PetscViewer);
132 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerGetSingleton(PetscViewer,PetscViewer*);
133 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerRestoreSingleton(PetscViewer,PetscViewer*);
134 
135 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSetUp(PetscViewer);
136 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerView(PetscViewer,PetscViewer);
137 
138 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSetOptionsPrefix(PetscViewer,const char[]);
139 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerAppendOptionsPrefix(PetscViewer,const char[]);
140 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerGetOptionsPrefix(PetscViewer,const char*[]);
141 
142 /*E
143     PetscViewerFormat - Way a viewer presents the object
144 
145    Level: beginner
146 
147 .seealso: PetscViewerSetFormat(), PetscViewer, PetscViewerType, PetscViewerPushFormat(), PetscViewerPopFormat()
148 E*/
149 typedef enum {
150   PETSC_VIEWER_ASCII_DEFAULT,
151   PETSC_VIEWER_ASCII_MATLAB,
152   PETSC_VIEWER_ASCII_MATHEMATICA,
153   PETSC_VIEWER_ASCII_IMPL,
154   PETSC_VIEWER_ASCII_INFO,
155   PETSC_VIEWER_ASCII_INFO_DETAIL,
156   PETSC_VIEWER_ASCII_COMMON,
157   PETSC_VIEWER_ASCII_SYMMODU,
158   PETSC_VIEWER_ASCII_INDEX,
159   PETSC_VIEWER_ASCII_DENSE,
160   PETSC_VIEWER_ASCII_VTK,
161   PETSC_VIEWER_ASCII_VTK_CELL,
162   PETSC_VIEWER_ASCII_VTK_COORDS,
163   PETSC_VIEWER_ASCII_PCICE,
164   PETSC_VIEWER_ASCII_PYLITH,
165   PETSC_VIEWER_ASCII_PYLITH_LOCAL,
166   PETSC_VIEWER_BINARY_DEFAULT,
167   PETSC_VIEWER_BINARY_NATIVE,
168   PETSC_VIEWER_DRAW_BASIC,
169   PETSC_VIEWER_DRAW_LG,
170   PETSC_VIEWER_DRAW_CONTOUR,
171   PETSC_VIEWER_DRAW_PORTS,
172   PETSC_VIEWER_NATIVE,
173   PETSC_VIEWER_NOFORMAT,
174   PETSC_VIEWER_ASCII_FACTOR_INFO} PetscViewerFormat;
175 
176 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSetFormat(PetscViewer,PetscViewerFormat);
177 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerPushFormat(PetscViewer,PetscViewerFormat);
178 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerPopFormat(PetscViewer);
179 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerGetFormat(PetscViewer,PetscViewerFormat*);
180 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerFlush(PetscViewer);
181 
182 /*S
183      PetscViewerASCIIMonitor - Context for the default KSP, SNES and TS monitors that print
184                                   ASCII strings of residual norms etc.
185 
186 
187    Level: advanced
188 
189   Concepts: viewing, monitoring
190 
191 .seealso:  PetscViewerCreate(), PetscViewerSetType(), PetscViewerType, KSPMonitorSet(), SNESMonitorSet(), TSMonitorSet(),
192            KSPMonitorDefault(), SNESMonitorDefault()
193 
194 S*/
195 struct _p_PetscViewerASCIIMonitor {
196   PetscViewer viewer;
197   PetscInt    tabs;
198 };
199 typedef struct _p_PetscViewerASCIIMonitor* PetscViewerASCIIMonitor;
200 
201 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIMonitorCreate(MPI_Comm,const char *,PetscInt,PetscViewerASCIIMonitor*);
202 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIMonitorDestroy(PetscViewerASCIIMonitor);
203 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIMonitorPrintf(PetscViewerASCIIMonitor,const char[],...);
204 
205 /*
206    Operations explicit to a particular class of viewers
207 */
208 
209 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIGetPointer(PetscViewer,FILE**);
210 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerFileGetMode(PetscViewer,PetscFileMode*);
211 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerFileSetMode(PetscViewer,PetscFileMode);
212 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIPrintf(PetscViewer,const char[],...) PETSC_PRINTF_FORMAT_CHECK(2,3);
213 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIISynchronizedPrintf(PetscViewer,const char[],...) PETSC_PRINTF_FORMAT_CHECK(2,3);
214 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIPushTab(PetscViewer);
215 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIPopTab(PetscViewer);
216 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIUseTabs(PetscViewer,PetscTruth);
217 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIISetTab(PetscViewer,PetscInt);
218 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryGetDescriptor(PetscViewer,int*);
219 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryGetInfoPointer(PetscViewer,FILE **);
220 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryRead(PetscViewer,void*,PetscInt,PetscDataType);
221 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryWrite(PetscViewer,void*,PetscInt,PetscDataType,PetscTruth);
222 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerStringSPrintf(PetscViewer,const char[],...) PETSC_PRINTF_FORMAT_CHECK(2,3);
223 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerStringSetString(PetscViewer,char[],PetscInt);
224 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerDrawClear(PetscViewer);
225 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerDrawSetInfo(PetscViewer,const char[],const char[],int,int,int,int);
226 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSocketSetConnection(PetscViewer,const char[],PetscInt);
227 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinarySkipInfo(PetscViewer);
228 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryLoadInfo(PetscViewer);
229 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinarySetSkipOptions(PetscViewer,PetscTruth);
230 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryGetSkipOptions(PetscViewer,PetscTruth*);
231 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryReadStringArray(PetscViewer,char***);
232 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerBinaryWriteStringArray(PetscViewer,char**);
233 
234 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerFileSetName(PetscViewer,const char[]);
235 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerFileGetName(PetscViewer,char**);
236 
237 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscPLAPACKInitializePackage(char *);
238 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscPLAPACKFinalizePackage(void);
239 
240 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerVUGetPointer(PetscViewer, FILE**);
241 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerVUSetVecSeen(PetscViewer, PetscTruth);
242 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerVUGetVecSeen(PetscViewer, PetscTruth *);
243 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerVUPrintDeferred(PetscViewer, const char [], ...) PETSC_PRINTF_FORMAT_CHECK(2,3);
244 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerVUFlushDeferred(PetscViewer);
245 
246 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMathematicaInitializePackage(char *);
247 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMathematicaFinalizePackage(void);
248 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMathematicaGetName(PetscViewer, const char **);
249 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMathematicaSetName(PetscViewer, const char []);
250 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMathematicaClearName(PetscViewer);
251 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMathematicaSkipPackets(PetscViewer, int);
252 
253 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSiloGetName(PetscViewer, char **);
254 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSiloSetName(PetscViewer, const char []);
255 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSiloClearName(PetscViewer);
256 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSiloGetMeshName(PetscViewer, char **);
257 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSiloSetMeshName(PetscViewer, const char []);
258 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerSiloClearMeshName(PetscViewer);
259 
260 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerNetcdfOpen(MPI_Comm,const char[],PetscFileMode,PetscViewer*);
261 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerNetcdfGetID(PetscViewer, int *);
262 
263 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerHDF4Open(MPI_Comm,const char[],PetscFileMode,PetscViewer*);
264 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerHDF4WriteSDS(PetscViewer viewer, float *xf, int d, int *dims, int bs);
265 
266 /*
267      These are all the default viewers that do not have
268    to be explicitly opened
269 */
270 EXTERN PetscViewer PETSC_DLLEXPORT PETSC_VIEWER_STDOUT_(MPI_Comm);
271 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIGetStdout(MPI_Comm,PetscViewer*);
272 EXTERN PetscViewer PETSC_DLLEXPORT PETSC_VIEWER_STDERR_(MPI_Comm);
273 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerASCIIGetStderr(MPI_Comm,PetscViewer*);
274 EXTERN PetscViewer PETSC_DLLEXPORT PETSC_VIEWER_DRAW_(MPI_Comm);
275 EXTERN PetscViewer PETSC_DLLEXPORT PETSC_VIEWER_SOCKET_(MPI_Comm);
276 EXTERN PetscViewer PETSC_DLLEXPORT PETSC_VIEWER_BINARY_(MPI_Comm);
277 EXTERN PetscViewer PETSC_DLLEXPORT PETSC_VIEWER_MATLAB_(MPI_Comm);
278 EXTERN PetscViewer PETSC_VIEWER_MATHEMATICA_WORLD_PRIVATE;
279 
280 #define PETSC_VIEWER_STDERR_SELF  PETSC_VIEWER_STDERR_(PETSC_COMM_SELF)
281 #define PETSC_VIEWER_STDERR_WORLD PETSC_VIEWER_STDERR_(PETSC_COMM_WORLD)
282 
283 /*MC
284   PETSC_VIEWER_STDOUT_WORLD  - same as PETSC_VIEWER_STDOUT_(PETSC_COMM_WORLD)
285 
286   Level: beginner
287 M*/
288 #define PETSC_VIEWER_STDOUT_WORLD PETSC_VIEWER_STDOUT_(PETSC_COMM_WORLD)
289 
290 /*MC
291   PETSC_VIEWER_STDOUT_SELF  - same as PETSC_VIEWER_STDOUT_(PETSC_COMM_SELF)
292 
293   Level: beginner
294 M*/
295 #define PETSC_VIEWER_STDOUT_SELF  PETSC_VIEWER_STDOUT_(PETSC_COMM_SELF)
296 
297 /*MC
298   PETSC_VIEWER_DRAW_WORLD  - same as PETSC_VIEWER_DRAW_(PETSC_COMM_WORLD)
299 
300   Level: intermediate
301 M*/
302 #define PETSC_VIEWER_DRAW_WORLD   PETSC_VIEWER_DRAW_(PETSC_COMM_WORLD)
303 
304 /*MC
305   PETSC_VIEWER_DRAW_SELF  - same as PETSC_VIEWER_DRAW_(PETSC_COMM_SELF)
306 
307   Level: intermediate
308 M*/
309 #define PETSC_VIEWER_DRAW_SELF    PETSC_VIEWER_DRAW_(PETSC_COMM_SELF)
310 
311 /*MC
312   PETSC_VIEWER_SOCKET_WORLD  - same as PETSC_VIEWER_SOCKET_(PETSC_COMM_WORLD)
313 
314   Level: intermediate
315 M*/
316 #define PETSC_VIEWER_SOCKET_WORLD PETSC_VIEWER_SOCKET_(PETSC_COMM_WORLD)
317 
318 /*MC
319   PETSC_VIEWER_SOCKET_SELF  - same as PETSC_VIEWER_SOCKET_(PETSC_COMM_SELF)
320 
321   Level: intermediate
322 M*/
323 #define PETSC_VIEWER_SOCKET_SELF  PETSC_VIEWER_SOCKET_(PETSC_COMM_SELF)
324 
325 /*MC
326   PETSC_VIEWER_BINARY_WORLD  - same as PETSC_VIEWER_BINARY_(PETSC_COMM_WORLD)
327 
328   Level: intermediate
329 M*/
330 #define PETSC_VIEWER_BINARY_WORLD PETSC_VIEWER_BINARY_(PETSC_COMM_WORLD)
331 
332 /*MC
333   PETSC_VIEWER_BINARY_SELF  - same as PETSC_VIEWER_BINARY_(PETSC_COMM_SELF)
334 
335   Level: intermediate
336 M*/
337 #define PETSC_VIEWER_BINARY_SELF  PETSC_VIEWER_BINARY_(PETSC_COMM_SELF)
338 
339 /*MC
340   PETSC_VIEWER_MATLAB_WORLD  - same as PETSC_VIEWER_MATLAB_(PETSC_COMM_WORLD)
341 
342   Level: intermediate
343 M*/
344 #define PETSC_VIEWER_MATLAB_WORLD PETSC_VIEWER_MATLAB_(PETSC_COMM_WORLD)
345 
346 /*MC
347   PETSC_VIEWER_MATLAB_SELF  - same as PETSC_VIEWER_MATLAB_(PETSC_COMM_SELF)
348 
349   Level: intermediate
350 M*/
351 #define PETSC_VIEWER_MATLAB_SELF  PETSC_VIEWER_MATLAB_(PETSC_COMM_SELF)
352 
353 #define PETSC_VIEWER_MATHEMATICA_WORLD (PetscViewerInitializeMathematicaWorld_Private(),PETSC_VIEWER_MATHEMATICA_WORLD_PRIVATE)
354 
355 /*
356    petscViewer writes to Matlab .mat file
357 */
358 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMatlabPutArray(PetscViewer,int,int,PetscScalar*,char*);
359 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMatlabGetArray(PetscViewer,int,int,PetscScalar*,char*);
360 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewerMatlabPutVariable(PetscViewer,const char*,void*);
361 
362 /*S
363      PetscViewers - Abstract collection of PetscViewers
364 
365    Level: intermediate
366 
367   Concepts: viewing
368 
369 .seealso:  PetscViewerCreate(), PetscViewerSetType(), PetscViewerType, PetscViewer, PetscViewersCreate(),
370            PetscViewersGetViewer()
371 S*/
372 typedef struct _n_PetscViewers* PetscViewers;
373 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewersCreate(MPI_Comm,PetscViewers*);
374 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewersDestroy(PetscViewers);
375 EXTERN PetscErrorCode PETSC_DLLEXPORT PetscViewersGetViewer(PetscViewers,int,PetscViewer*);
376 
377 PETSC_EXTERN_CXX_END
378 #endif
379