Hi,
Pd symbols are immutable and permanent. `gensym("foo")` looks if the
symbol "foo" already exists; if yes, it just returns it, otherwise it
creates a new symbol, adds it to the global symbol table and finally
returns it.
You must never attempt to free a symbol!
```
t_symbol **x_weights_arrays;
t_symbol *x_biases_array;
```
Here you must only free `x_weights_array`, which is an array of
`t_symbol*`, but not the `t_symbol*` elements themselves.
---
Side note: since symbols are unique and persistent, they can be compared
*by address*. In other words, two symbols are equal if they have the
same address. This is different from ordinary C-strings which may reside
at different memory locations and thus need to be compared with
`strcmp()` (or equivalent functions).
Christof
On 22.02.2024 10:19, Alexandros Drymonitis wrote:
I have a data structure with a symbol and an array of symbols that
store array names defined as:
```
t_symbol **x_weights_arrays;
t_symbol *x_biases_array;
```
When I'm done with them, I want to free the memory, but calling
free(x_biases_array) doesn't seem to work, and once called, as soon as
I try to do something else in Pd (like unlock the patch and choose an
object), Pd crashes.
I have narrowed down the error to freeing these symbols, and I'm sure
the crash is not caused by something else. I scanned m_pd.h to see if
there is a function to free t_symbol memory, but didn't seem to find
anything. This might be something obvious for C-savvy people, but I'm
not one, so any advice is welcome.
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