_opt Mnemonic - Dave's Blog

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_opt Mnemonic

2011 May 24, 11:00

​I always have trouble remembering where the opt goes in SAL in the __deref_out case. The mnemonic is pretty simple: the _opt at the start of the SAL is for the pointer value at the start of the function. And the _opt at the end of the SAL is for the dereferenced pointer value at the end of the function.






SAL foo == nullptr allowed at function start? *foo == nullptr allowed at function end?
__deref_out void **foo No No
__deref_opt_out void **foo Yes No
__deref_out_opt void **foo No Yes
__deref_opt_out_opt void **foo Yes Yes
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