Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
JasonB`WeakCache`
CreateReference  |
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Details and Options
Examples
(2)
Basic Examples
(2)
Create an object during and return a strong reference to it:
In[1]:=
$HistoryLength=0;
In[2]:=
SeedRandom[42];obj=RandomGraph[{10,15}];
[obj,Echo["deleting obj now"]];ref=
[obj]
 | CleanupAfter |
| CreateReference |
Out[2]=
<
StrongReference>
is used above to demonstrate when the underlying object is deleted from memory. Clearing the variable obj does not delete all references to the data:
In[3]:=
obj=.
You can still retrieve the stored object using the following notation:
In[4]:=
ref[]
Out[4]=
Note that is not equal to :
ref
obj
In[5]:=
ByteCount/@{ref,ref[]}
Out[5]=
{40,888}
ref
In[6]:=
ref=.
»
deleting obj now
Create an object during and return a weak reference to it:
In[1]:=
$HistoryLength=0;
In[2]:=
obj=RandomGraph[{10,15}];
[obj,Echo["deleting obj now"]];ref=
[obj,"Weak"]
| CleanupAfter |
| CreateReference |
Out[2]=
<WeakReference>
is used above to demonstrate when the underlying object is deleted from memory. Clearing the variable obj will delete all references to the data:
In[3]:=
obj=.
»
deleting obj now
You can no longer retrieve the stored object using the weak reference:
In[4]:=
ref[]
Out[4]=
Failure
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""