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| Newsgroups | comp.lang.c++ |
| Subject | Re: singleton design |
| References | <320ced85-f297-49bd-80a1-4c3f23aee7ba@glegroupsg2000goo.googlegroups.com> |
| From | Lasse Reichstein Nielsen <lrn.unread@gmail.com> |
| Date | Mon, 01 Aug 2011 18:39:57 +0200 |
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asit <lipun4u@gmail.com> writes: > I want to design a singleton class. Ick. Please reconsider. There is usually no good reason to enforce that there is only one instance of a class. Modelling-wise it might make sense to only actually create one instance, but using the singleton (anti-)pattern tends to bite you if you want to test either the class itself or classes depending on it. > here the rule is to make the constructor private. That's okey. What > about copy constructor and assignment operator. If I make it > private, certain things like copying and assigning will lead to > compiler error. How can I handle them ?? If you want to only have one copy, you don't want to have assignment or copying creating more than one instance. If the object is immutable, it might not make any difference, but it still prevents it from being a singleton. You should only pass the object around by reference or pointer. /L -- Lasse Reichstein Holst Nielsen DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleDOM.html> 'Faith without judgement merely degrades the spirit divine.'
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singleton design asit <lipun4u@gmail.com> - 2011-07-31 13:22 -0700 Re: singleton design Dombo <dombo@disposable.invalid> - 2011-07-31 22:29 +0200 Re: singleton design Lasse Reichstein Nielsen <lrn.unread@gmail.com> - 2011-08-01 18:39 +0200
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