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Re: bug in latest svn [message #15683 is a reply to message #15681]

Sun, 04 May 2008 17:14

mdelfede
Messages: 1307
Registered: September 2007

Ultimate Contributor

Novo wrote on Sun, 04 May 2008 17:04

const String& GetCppFile(int i);

String value1 = GetCppFile(0); // Case A
const String& value2 = GetCppFile(0); // Case B

In case A GetCppFile() will work correctly.
Case B will introduce a bug.

IMHO, returning "const String&" is just not thread-safe. Object can be deleted in transition.

I guess you're right, with your 2 examples.
On first example it 'should' work, because the source string isn't deleted before assignment, so the value is transferred. The secon example is buggy because you return a reference to an object that'll be deleted soon. BTW, I don't know how does the compiler behave with the const modifier.... but I guess it'll not solve the problem.

So the code is bad, imo.... is that maybe the problem ?

Max

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[Message index]

		bug in latest svn By: mdelfede on Thu, 01 May 2008 15:35
		Re: bug in latest svn By: Novo on Thu, 01 May 2008 19:52
		Re: bug in latest svn By: bytefield on Thu, 01 May 2008 20:01
		Re: bug in latest svn By: mdelfede on Thu, 01 May 2008 20:45
		Re: bug in latest svn By: bytefield on Thu, 01 May 2008 21:10
		Re: bug in latest svn By: Novo on Thu, 01 May 2008 22:31
		Re: bug in latest svn By: mdelfede on Thu, 01 May 2008 23:00
		Re: bug in latest svn By: Novo on Thu, 01 May 2008 23:28
		Re: bug in latest svn By: bytefield on Thu, 01 May 2008 23:51
		Re: bug in latest svn By: mdelfede on Fri, 02 May 2008 00:16
		Re: bug in latest svn By: bytefield on Fri, 02 May 2008 00:49
		Re: bug in latest svn By: mdelfede on Fri, 02 May 2008 00:55
		Re: bug in latest svn By: Novo on Fri, 02 May 2008 01:04
		Re: bug in latest svn By: mdelfede on Fri, 02 May 2008 09:44
		Re: bug in latest svn By: Novo on Fri, 02 May 2008 22:15
		Re: bug in latest svn By: mdelfede on Fri, 02 May 2008 23:45
		Re: bug in latest svn By: Novo on Sat, 03 May 2008 17:42
		Re: bug in latest svn By: mdelfede on Sat, 03 May 2008 19:17
		Re: bug in latest svn By: mdelfede on Sun, 04 May 2008 00:07
		Re: bug in latest svn By: Novo on Sun, 04 May 2008 03:35
		Re: bug in latest svn By: mdelfede on Sun, 04 May 2008 12:17
		Re: bug in latest svn By: Novo on Sun, 04 May 2008 17:04
		Re: bug in latest svn By: mdelfede on Sun, 04 May 2008 17:14
		Re: bug in latest svn By: Novo on Sun, 04 May 2008 17:11
		Re: bug in latest svn By: mdelfede on Sun, 04 May 2008 17:16
		Re: bug in latest svn By: mdelfede on Sun, 04 May 2008 17:43
		Re: bug in latest svn By: Novo on Sun, 04 May 2008 18:07
		Re: bug in latest svn By: mdelfede on Sun, 04 May 2008 18:12
		Re: bug in latest svn By: Novo on Tue, 06 May 2008 04:10
		Re: bug in latest svn By: mirek on Sun, 04 May 2008 18:28
		Re: bug in latest svn By: mdelfede on Sun, 04 May 2008 21:46
		Re: bug in latest svn By: Novo on Tue, 06 May 2008 04:07
		Re: bug in latest svn By: mirek on Wed, 07 May 2008 13:59
		Re: bug in latest svn By: mdelfede on Wed, 07 May 2008 14:39
		Re: bug in latest svn By: Novo on Wed, 07 May 2008 22:07
		Re: bug in latest svn By: Novo on Fri, 02 May 2008 00:15
		Re: bug in latest svn By: mr_ped on Wed, 07 May 2008 14:13

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