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1-2 SOMobjects Base Toolkit: Programmer’s Reference Manual
somApply Function
Purpose
Invokes an apply stub. Apply stubs are never invoked directly by SOM users, the somApply
function must be used instead.
Syntax
boolean somApply (
SOMObject objPtr,
somToken *retVal,
somMethodDataPtr mdPtr,
va_list args);
Description
somApply provides a single uniform interface through which it is possible to call any
method procedure. The interface is based on the caller passing: the object to which the
method procedure is to be applied; a return address for the method result; a
somMethodDataPtr indicating the desired method procedure; and an ANSI standard va_list
structure containing the method procedure arguments. Different method procedures expect
different argument types and return different result types, so the purpose of somApply is to
select an apply stub appropriate for the specific method involved, according to the supplied
method data, and then call this apply stub. The apply stub removes the arguments from the
va_list, calls the method procedure with these arguments, accepts the returned result, and
then copies this result to the location pointed to by retVal.
The method procedure used by the apply stub is determined by the content of the
somMethodData structure pointed to by mdPtr. The class methods somGetMethodData
and somGetNthMethodData are used to load a somMethodData structure. These
methods resolve static method procedures based on the receiving class’s instance method
table.
The SOM API requires that information necessary for selecting an apply stub be provided
when a new method is registered with its introducing class (by way of the methods
somAddStaticMethod or somAddDynamicMethod). This is required because SOM itself
needs apply stubs when dispatch method resolution is used. C and C++ implementation
bindings for SOM classes support this requirement, but SOM does not terminate execution
if this requirement is not met by a class implementor. Thus, it is possible that there may be
methods for which somApply cannot select an appropriate apply stub. The
somMethodData structure for the method can be inspected before calling somApply to
verify that the method data contains sufficient information to select an appropriate apply
stub: either the applyStub component or the stubInfo component of this structure must be
non-NULL. If these conditions are met, then somApply performs as described previously,
and a TRUE value is returned; otherwise FALSE is returned.
Parameters
objPtr A pointer to the object on which the method procedure is to be invoked.
retVal A pointer to the memory region into which the result returned by the method
procedure is to be copied. This pointer cannot be null (even in the case of
method procedures whose returned result is void).
mdPtr A pointer to the somMethodData structure that describes the method
whose procedure is to be executed by the apply stub.
- 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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