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Description: 
 This function sets a flag indicating if allocated but
unused memory should be cached or not. It also returns the original value of the
flag.
If caching is switched on or off as a result of this call, then the current contents of
the cache are discarded.
Note, each thread has a separate cache. Calling this function affects only the
currently executing thread.  
Synopsis 
 int astMemCaching( int newval )  
 Parameters: 
 
newval  
 The new value for the MemoryCaching tuning parameter (see 
astTune in
objectc.c). If AST__TUNULL is supplied, the current value is left unchanged.  
 
Returned Value 
  astMemCaching()  
 The original value of the MemoryCaching tuning
parameter.  
    Copyright (C) 2021 East Asian Observatory
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 A Library for Handling
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