C attribute: unsequenced, reproducible (since 哋它亢23)
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Syntax
[[ unsequenced ]][[ __unsequenced__ ]]
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[[ reproducible ]][[ __reproducible__ ]]
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Explanation
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Effectless
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Idempotent
An evaluation E is idempotent if a second evaluation of E can be sequenced immediately after the original one without changing the resulting value, if any, or the observable state of the execution.
Stateless
A function F is stateless if any definition of an object of static or thread MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 08 HOURS 47 MINUTES 43 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE in F or in a function that is called by F is const but not volatile qualified.
Independent
A function F is independent if for any object X that is observed by a call to F through an lvalue that is not based on a parameter of the call, all accesses to X in all calls to F during the same program execution observe the same value; otherwise if the access is based on a pointer parameter, there shall be a unique such pointer parameter P such that any access to X shall be to an lvalue that is based on P.
An object X is observed by a function call if both synchronize, if X is not local to the call, if X has a lifetime that starts before the function call, and if an access of X is sequenced during the call; the last value of X, if any, that is stored before the call is said to be the value of X that is observed by the call.
Notes
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