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#!F-adobe-helvetica-medium-r-normal--18*
#!N
#!N #!Rdxgcev DXGetCacheEntry, DXGetCacheEntryV #!N #!N Function #!N #!N Retrieve a
cache entry. #!N #!N Syntax #!N #!F-adobe-times-bold-r-normal--18* #include <dx/dx.h> Object DXGetCacheEntry(char
*function, int key, int n, ...) Object DXGetCacheEntryV(char *function, int key,
int n, Object *in) #!EF #!N #!N Functional Details #!N #!N
Both routines return the Object referenced by a cache entry. The
cache is indexed by a key created from #!F-adobe-times-bold-r-normal--18* function #!EF
, #!F-adobe-times-bold-r-normal--18* key #!EF , #!F-adobe-times-bold-r-normal--18* n #!EF , and the
Objects in the Array #!F-adobe-times-bold-r-normal--18* in #!EF . These must be
the same values as those used when the Object was placed
in the cache with #!F-adobe-times-bold-r-normal--18* DXSetCacheEntry #!EF . #!N #!N #!I0
#!N Notes: #!N #!I30 #!N 1. Because Data Explorer modules follow
pure function semantics, the cache should #!F-adobe-times-medium-i-normal--18* not #!EF be used
to store a state that affects the output of the module.
A module must always be able to recreate the Object from
the same set of inputs; the cache should only be used
as an optimization tool. #!N #!I30 #!N 2. On a multiprocessor
machine, processor local information should #!F-adobe-times-medium-i-normal--18* not #!EF be stored in
the cache, since its contents may be retrieved on another processor.
#!N #!I30 #!N 3. The cache is local to one machine
and cannot be used to communicate information between modules on different
machines when running in distributed mode. #!I0 #!N #!N Since DXGetCacheEntry
returns an Object that is referenced so that it will not
be deleted, you must delete it when you are finished with
it. Failure to do so will result in a memory leak.
#!N #!N For additional details on the deletion of cached Objects,
see #!F-adobe-times-bold-r-normal--18* DXSetCacheEntry #!EF . #!N #!N Return Value #!N #!N
Returns the cached output Object or returns #!F-adobe-times-bold-r-normal--18* NULL #!EF but
does not set an error code if no such cache entry
exists. #!N #!N See Also #!N #!N #!F-adobe-times-bold-r-normal--18* #!Ldxdel,dxall1195 h DXDelete #!EL , #!Ldxref,dxall1353 h DXReference #!EL
, #!Ldxscev,dxall1369 h DXSetCacheEntry, DXSetCacheEntryV #!EL , #!Ldxgsot,dxall1255 h DXGetObjectTag, DXSetObjectTag #!EL #!EF #!N #!N #!Lcache,dxall1102 h Cache #!EL . #!N #!N
#!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Ldxgcmp,dxall1225 h DXGetCameraMatrix, DXGetCameraRotation, DXGetCameraMatrixWithFuzz #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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