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Re: Hiding variables... take them seriously!!! [message #9470 is a reply to message #9468]

Tue, 29 September 2009 15:24

Mohammad Al-Turany
Messages: 518
Registered: April 2004
Location: GSI, Germany

first-grade participant

From: *gsi.de

Hallo Sebastian,

it good that you give this example! in fact what you have here is also some kind of violation against the C++ standard,

Here's what the C++ Standard says (17.4.3.1.2):

Quote:

"Each name that contains a double underscore (_ _) or begins with an underscore followed by an uppercase letter is reserved to the implementation"

However, some compilers allow this, because for all it knows your code could be
part of the OS or libc that has the legitimate right to use such identifiers.
But technically it's actually undefined behavior, the reason being that you
may tread on a reserved name.

In our case here the compiler simply ignore your underscore and then you get this warning. So it is not completely meaningless and you can look yourself that many books and forums advice not use the underscore in a variable name!

regards

Mohammad

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[Message index]

		Problem with hiding (shadowing) variables By: Mohammad Al-Turany on Sat, 19 September 2009 00:01
		Hiding variables... take them seriously!!! By: Johan Messchendorp on Mon, 28 September 2009 22:51
		Re: Hiding variables... take them seriously!!! By: Sebastian Neubert on Tue, 29 September 2009 11:15
		Re: Hiding variables... take them seriously!!! By: StefanoSpataro on Tue, 29 September 2009 12:05
		Re: Hiding variables... take them seriously!!! By: Sebastian Neubert on Tue, 29 September 2009 12:11
		Re: Hiding variables... take them seriously!!! By: Mohammad Al-Turany on Tue, 29 September 2009 12:21
		Re: Hiding variables... take them seriously!!! By: Sebastian Neubert on Tue, 29 September 2009 13:16
		Re: Hiding variables... take them seriously!!! By: Mohammad Al-Turany on Tue, 29 September 2009 13:36
		Re: Hiding variables... take them seriously!!! By: Sebastian Neubert on Tue, 29 September 2009 14:34
		Re: Hiding variables... take them seriously!!! By: Mohammad Al-Turany on Tue, 29 September 2009 15:24
		Re: Hiding variables... take them seriously!!! By: Sebastian Neubert on Tue, 29 September 2009 16:43
		Re: Hiding variables... take them seriously!!! By: Mohammad Al-Turany on Tue, 29 September 2009 16:56
		Re: Hiding variables... take them seriously!!! By: Sebastian Neubert on Tue, 29 September 2009 17:05
		Re: Hiding variables... take them seriously!!! By: Mohammad Al-Turany on Wed, 30 September 2009 11:59
		Re: Hiding variables... take them seriously!!! By: StefanoSpataro on Thu, 29 October 2009 17:33
		Re: Hiding variables... take them seriously!!! By: Johan Messchendorp on Thu, 29 October 2009 22:46

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