Re: Usage of pre-processor macro.
On 30 juuni, 20:11, Pete Becker <p...@versatilecoding.com> wrote:
On 2010-06-30 10:50:46 -0400, Christian Hackl said:
Pete Becker ha scritto:
On 2010-06-30 07:02:44 -0400, Helge Kruse said:
If you omit the UNREF_PARAM, the compiler may warn about unreferenced
parameter(s). The macro creates code where the parameter is assigned =
to
itself. This doesn't hurt and is optimized away if optimization is
enabled.
Turn off stupid warnings.
I often see this warning labelled as "stupid", but have you never had a
situation in which, by accident, you really were using the wrong
variable in the function? Something along the lines of:
int MyClass::calculate(int x, int y)
{
return complicatedCalculation(x, x); // bug, should be x, y
}
Are some "false positives" of this warning a reason to give away a
chance to automatically detect such bugs?
Yes. If you've written good unit tests, ignoring a function argument
that matters will always be detected.
Unit tests do not usually test design problems, so how they help?
Parameters that do not matter are usually present because of a design
problem. Problem is that virtual function does not manage too well
with its two responsibilities:
1) to allow polymorphism.
2) to be convenient interface.
When that problem is acknowledged (and decision is made to ignore it)
then it is OK to suppress that warning at that place. When such design
(pointless parameters) is forced upon developer by overly intrusive
library it might be annoying, yes. I would consider giving a good kick
to such library instead of turning off the warning globally, however.
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