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