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SOMobjects Base Toolkit: Programmer’s Reference Manual
is_nil Method
Purpose
Tests to see if the object reference is nil.
IDL Syntax
boolean is_nil ( );
Description
The is_nil method tests to see if the specified object reference is nil.
Parameters
receiver A pointer to any object, either a SOMObject or a SOMDObject. The
pointer can be NULL.
env A pointer to the Environment structure for the method caller.
Return Value
The is_nil method returns TRUE if the object reference is empty. Otherwise, is_nil returns
FALSE.
Example
#include <somd.h>
Environment ev;
SOMDObject objref;
SOMObject somobj;
...
/* This code might be part of the code
* that overrides the somdSOMObjFromRef method, i.e.
* in an implementation of a subclass of SOMDServer called
* myServer
*/
if (_is_nil(objref, &ev) ||
_somIsA(objref, SOMDClientProxyNewClass(0, 0)) ||
_is_SOM_ref(objref, &ev)) {
somobj = myServer_parent_SOMDServer_somdSOMObjFromRef
(somSelf, &ev, objref);
}
else {
/* do the myServer–specific stuff to create/find somobj here */
}
return somobj;
Related Information
Methods: create, is_constant, is_proxy, is_SOM_ref
- Bull DPX/20 1
- About This Book 5
- Contents 7
- SOM Kernel Reference 1-1 13
- C++ Example 15
- SOM Kernel Reference 1-5 17
- SOM Kernel Reference 1-9 21
- ++ language bindings 22
- SOM Kernel Reference 1-13 25
- SOM Kernel Reference 1-15 27
- SOM Kernel Reference 1-17 29
- SOM Kernel Reference 1-19 31
- SOM Kernel Reference 1-25 37
- SOM Kernel Reference 1-27 39
- ++ usage bindings use this 42
- ++ usage 42
- SOM Kernel Reference 1-33 45
- SOM Kernel Reference 1-35 47
- SOM Kernel Reference 1-37 49
- SOMCalloc Function 51
- SOMClassInitFuncName Function 52
- SOMDeleteModule Function 53
- SOMError Function 54
- SOMFree Function 55
- SOMInitModule Function 56
- SOMLoadModule Function 58
- SOMMalloc Function 59
- SOMOutCharRoutine Function 60
- SOMRealloc Function 61
- SOM_Assert Macro 62
- SOM_ClassLibrary Macro 63
- SOM Kernel Reference 1-53 65
- SOM_Error Macro 66
- SOM_Expect Macro 67
- SOM_GetClass Macro 68
- SOM_InitEnvironment Macro 69
- SOM_MainProgram Macro 70
- SOM_NoTrace Macro 71
- SOM_ParentNumResolve Macro 72
- SOM_Resolve Macro 73
- SOM_ResolveNoCheck Macro 74
- SOM_SubstituteClass Macro 75
- SOM_Test Macro 76
- SOM_TestC Macro 77
- SOM_UninitEnvironment Macro 78
- SOM_WarnMsg Macro 79
- SOMClass Class 80
- Introduced Methods 81
- Deprecated Methods 82
- SOM Kernel Reference 1-71 83
- SOM Kernel Reference 1-75 87
- SOM Kernel Reference 1-79 91
- SOM Kernel Reference 1-83 95
- SOM Kernel Reference 1-85 97
- SOM Kernel Reference 1-87 99
- SOM Kernel Reference 1-89 101
- NULL is returned 101
- SOM Kernel Reference 1-91 103
- SOM Kernel Reference 1-93 105
- SOM Kernel Reference 1-95 107
- SOM Kernel Reference 1-97 109
- SOM Kernel Reference 1-99 111
- Related Information 112
- Original Class 112
- SOM Kernel Reference 1-101 113
- IDL Syntax 114
- Description 114
- Parameters 114
- Return Value 114
- SOMClassMgr Class 117
- New Methods 118
- Overridden Methods 118
- SOM Kernel Reference 1-107 119
- Return Values 120
- C Example 121
- SOM Kernel Reference 1-117 129
- SOM Kernel Reference 1-123 135
- SOMObject Class 138
- SOM Kernel Reference 1-139 151
- SOM Kernel Reference 1-143 155
- SOM Kernel Reference 1-145 157
- SOM Kernel Reference 1-153 165
- DSOM Framework Reference 169
- DSOM and CORBA 170
- ORBfree Function 172
- C Syntax 173
- SOMD_Init Function 176
- SOMD_NoORBfree Function 177
- SOMD_Uninit Function 180
- Context_delete Macro 181
- Request_delete Macro 182
- BOA Class 184
- Context Class 196
- ImplementationDef Class 204
- ImplRepository Class 206
- NVList Class 218
- ObjectMgr Class 229
- ORB Class 235
- Principal Class 241
- Request Class 242
- SOMDClientProxy Class 253
- Overridden methods 254
- SOMDObject Class 263
- SOMDObjectMgr Class 276
- SOMDServer Class 281
- SOMDServerMgr Class 289
- _ServerDisabled or 293
- SOMOA Class 297
- _NoMessages is returned as 304
- AttributeDef Class 308
- Overriding Methods 309
- ConstantDef Class 310
- Contained Class 312
- Container Class 318
- ExceptionDef Class 325
- InterfaceDef Class 327
- Attributes 328
- ModuleDef Class 331
- OperationDef Class 332
- ParameterDef Class 334
- Repository Class 336
- TypeDef Class 342
- TypeCode_alignment Function 343
- TypeCode_copy Function 344
- TypeCode_equal Function 345
- TypeCode_free Function 346
- TypeCode_kind Function 347
- TypeCodeNew Function 350
- TypeCode_param_count Function 352
- TypeCode_parameter Function 353
- TypeCode_print Function 355
- TypeCode_size Function 357
- SOMMBeforeAfter Metaclass 360
- SOMMSingleInstance Metaclass 365
- ++, or the somNew method 366
- SOMMTraced Metaclass 367
- SOMEClientEvent Class 370
- SOMEEMan Class 375
- SOMEEMRegisterData Class 391
- SOMEEvent Class 399
- SOMESinkEvent Class 404
- SOMETimerEvent Class 407
- SOMEWorkProcEvent Class 410
- NOM / NAME : Date : 419
- SOCIETE / COMPANY : 419
- ADRESSE / ADDRESS : 419
- 86 A2 28AQ 01 422
- ORDER REFERENCE 422
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