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Memory allocation: Difference between revisions
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=={{header|SNOBOL4}}==
In SNOBOL4, simple data values are just created and assigned to variables. Here, three separate strings are concatenated and stored as a newly allocated string variable:
<lang snobol4> newstring = "This is creating and saving" " a new single string " "starting with three separate strings."</lang>
Empty arrays are created by using the built-in function (the size is determined when it is created):
<lang snobol4> newarray = array(100)</lang>
Empty tables are similarly created using the built-in function (new entries can be simply added at any later time by just storing them into the table):
<lang snobol4> newtable = table()</lang>
User-defined datatypes (usually, multi-field structures) are defined using the data() built-in function (which creates the constructor and field access functions):
<lang snobol4> data("listnode(next,prev,datafield1,datafield2)")</lang>
Then you allocate a new example of the defined listnode data item by using the constructor the data() function created:
<lang snobol4> newnode = listnode(,,"string data value1",17)</lang>
The example thus created can be updated using the field access functions also created by the data() function:
<lang snobol4> datafield1(newnode) = "updated data value 1"</lang>
You don't need to explicitly de-allocate memory. When you leave a function which has declared local variables, data stored in those local variables is released upon return. You can also just store a null string into a variable, releasing the value that was stored in that variable previously:
<lang snobol4> newnode = </lang>
SNOBOL4 automatically garbage collects released data items on an as-needed basis, and moves allocated items to consolidate all released space (so memory fragmentation is never a problem). You can explicitly garbage collect if you really want to:
<lang snobol4> collect()
=={{header|Tcl}}==
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