You're checking the out_error for nullity every time you call the function.
Having said that, the optional parameter works nicely too, and (this is a matter of taste, I suppose) easier to read in the case you don't have other parameter options.
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You're checking the out_error for nullity every time you call the function.
Having said that, the optional parameter works nicely too, and (this is a matter of taste, I suppose) easier to read in the case you don't have other parameter options.