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Bug 10135 – core.bitop: btc, btr, btc is "pure" but have side effects

Status: RESOLVED
Resolution: INVALID
Severity: trivial
Priority: P2
Component: druntime
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2013-05-22T08:57:00Z
Last change time: 2013-05-23T01:16:55Z
Assigned to: nobody
Creator: 4denizzz

Comments

Comment #0 by 4denizzz — 2013-05-22T08:57:12Z

core.bitop: btc, btr, btc is "pure" but have side effects

Comment #1 by clugdbug — 2013-05-23T01:13:40Z

> core.bitop: btc, btr, btc is "pure" but have side effects What do you mean? They don't modify any globals.

Comment #2 by alex — 2013-05-23T01:16:55Z

Yes, they are pure per the D definition. Even if a function mutates the memory pointed to by a pointer given to the function, it is still pure because that pointer is considered an input. See: http://klickverbot.at/blog/2012/05/purity-in-d/