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Re: Strange behavior of Point in watches [message #22948 is a reply to message #22908]

Wed, 02 September 2009 04:47

dolik.rce is currently offline

dolik.rce
Messages: 1789
Registered: August 2008
Location: Czech Republic

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dolik.rce@gmail.com

Helo Mirek!

Sorry it took me so long, but I was busy at work.

I did a little investigation and finally found exact piece of code that causes problems in gdb. I'm not sure what is the real reason, but all the troubles are caused by following constructors:

	Point_(const Point_<int>& pt) : x((T)pt.x), y((T)pt.y) {}
	Point_(const Point_<short>& pt) : x((T)pt.x), y((T)pt.y) {}
	Point_(const Point_<double>& pt) : x((T)pt.x), y((T)pt.y) {}
	Point_(const Point_<int64>& pt) : x((T)pt.x), y((T)pt.y) {}

If you replace those four lines by

	template <class U>
	Point_(const Point_<U>& pt) : x((T)pt.x), y((T)pt.y) {}

watches show correct values. Do you think that this workaround is safe? To my best knowledge it should produce absolutely same results as original code and nobody should try passing there any non-scalar type, so it should not cause any harm... but I'm no expert when it comes to templates Rolling Eyes

Rolling Eyes

Also, during the investigation I found that same problems apply to Size_ and Rect_. Since their anatomy is very similar, it should be possible to apply the same workaround.

Honza

[Updated on: Wed, 02 September 2009 04:49]

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[Message index]

		Strange behavior of Point in watches By: dolik.rce on Tue, 25 August 2009 09:42
		Re: Strange behavior of Point in watches By: mirek on Tue, 25 August 2009 10:07
		Re: Strange behavior of Point in watches By: dolik.rce on Tue, 25 August 2009 20:44
		Re: Strange behavior of Point in watches By: mirek on Wed, 26 August 2009 09:00
		Re: Strange behavior of Point in watches By: dolik.rce on Thu, 27 August 2009 05:06
		Re: Strange behavior of Point in watches By: dolik.rce on Wed, 02 September 2009 04:47
		Re: Strange behavior of Point in watches By: mirek on Wed, 02 September 2009 17:59
		Re: Strange behavior of Point in watches By: dolik.rce on Wed, 02 September 2009 19:17
		Re: Strange behavior of Point in watches By: mirek on Wed, 02 September 2009 20:43
		Re: Strange behavior of Point in watches By: dolik.rce on Thu, 03 September 2009 10:19
		Re: Strange behavior of Point in watches By: mr_ped on Thu, 03 September 2009 11:11
		Re: Strange behavior of Point in watches By: dolik.rce on Thu, 03 September 2009 19:00
		Re: Strange behavior of Point in watches By: mr_ped on Fri, 04 September 2009 08:32

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