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Re: Variable scope: inside or outside the loop
Reshat Sabiq wrote:
Stylistically i like and usually declare variables inside the loop, when
they are not used outside the loop, and no avoidable malloc overhead is
caused.
However, if the compiler is not smart enough to push and pop only once,
outside the loop, in this case each iteration of the loop will run with
the unnecessary overhead of push and pop.
Declarations do not cause pushes/pops. Moving a declaration (as opposed
to the initialization) does not change the generated bytecode. (It may
change the debugging info.)
P.S. Does the answer change from Java, to C++, to VC++?
No.
P.P.S. If there is no definitive answer, should the second approach be
used just out of caution?
No - use the first approach.
--
--Per Bothner
per@bothner.com http://per.bothner.com/