From 2422306598240368790 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,9ba786ca7952a128 X-Google-Attributes: gidf78e5,public X-Google-Thread: 109fba,9ba786ca7952a128 X-Google-Attributes: gid109fba,public From: Marcelo Cantos Subject: Re: STL overloads != operator of MyClass! Date: 1997/04/06 Message-ID: #1/1 X-Deja-AN: 231221444 References: <3347DC7E.5861ED04@arrakis.es> X-Original-Date: 07 Apr 1997 13:07:54 +1000 Organization: Royal Melbourne Institute of Technology, Melbourne, Australia. X-Auth: PGPMoose V1.1 PGP comp.std.c++ Newsgroups: comp.lang.c++,comp.std.c++ Originator: austern@isolde.mti.sgi.com Ildefonso Junquero writes: > I'm using stl that comes whit gcc 2.7.2, and i get surprised because g++ > takes precedence of stl templated operator != than a class operator !=. > Here is an example : > > #include > #include > typedef enum MyBool { myFalse, myTrue }; > > friend ostream& operator<<(ostream&os, const MyBool &mb) ^^^^^^ this is illegal. A function can't declare itself to be the friend of a class. This the class's prerogative. > [snip, snip] > The output is : > > True > 0 <<--- I expected False! > > Can someone explain me why?, Is this an g++ bug? > It works like i expected in Borland C++ 4.52 . FWIW: The Sun compiler (4.2) produces the correct output. > What does the standrad says? Class members should override global functions. 13.3.3 Best Viable Function [over.match.best] 1 [Paraphrased, F1 beats F2 if...] ... --F1 is a non-template function and F2 is a template function special- ization,... -- ______________________________________________________________________ Marcelo Cantos, Research Assistant __/_ marcelo@mds.rmit.edu.au Multimedia Database Systems Group, RMIT / _ Tel 61-3-9282-2497 723 Swanston St, Carlton VIC 3053 Aus/ralia ><_> Fax 61-3-9282-2490 Acknowledgements: errors - me; wisdom - God; funding - RMIT --- [ comp.std.c++ is moderated. To submit articles: Try just posting with your newsreader. If that fails, use mailto:std-c++@ncar.ucar.edu comp.std.c++ FAQ: http://reality.sgi.com/austern/std-c++/faq.html Moderation policy: http://reality.sgi.com/austern/std-c++/policy.html Comments? mailto:std-c++-request@ncar.ucar.edu ]