C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Template to remove reference.          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message jeff_d_harper@hotmail.com Guest Posted: Fri Oct 28, 2005 4:16 pm    Post subject: Template to remove reference. Hi, I need a template that will remove references from a type. Suppose the template I need is named Drop_ref. I'd like to do something like this .. . . Drop_ref<SomeClass &>::type InstanceOfSomeClass; would be equivalent to SomeClass InstanceOfSomeClass; Unfortunately, it must work with a C++ compiler that does not have partial template specialization. Microsoft has yet to bring Embedded Visual C++ up to ISO standards. If someone could post a work around I'd be very appreciative. Back to top mlimber Guest Posted: Fri Oct 28, 2005 6:44 pm    Post subject: Re: Template to remove reference. [email]jeff_d_harper (AT) hotmail (DOT) com[/email] wrote: Quote: Hi, I need a template that will remove references from a type. Suppose the template I need is named Drop_ref. I'd like to do something like this . . . Drop_ref<SomeClass &>::type InstanceOfSomeClass; would be equivalent to SomeClass InstanceOfSomeClass; Unfortunately, it must work with a C++ compiler that does not have partial template specialization. Microsoft has yet to bring Embedded Visual C++ up to ISO standards. If someone could post a work around I'd be very appreciative. See the implementations in Boost.TypeTraits (http://boost.org) and Loki ([url]http://sourceforge.net/projects/loki-lib/)[/url]. They both have some tricks to make it work with VC++ 6. Cheers! --M Back to top Victor Bazarov Guest Posted: Fri Oct 28, 2005 6:55 pm    Post subject: Re: Template to remove reference. mlimber wrote: Quote: jeff_d_harper (AT) hotmail (DOT) com wrote: [...request that could be easily satisfied with partial specialisation...] Unfortunately, it must work with a C++ compiler that does not have partial template specialization. Microsoft has yet to bring Embedded Visual C++ up to ISO standards. If someone could post a work around I'd be very appreciative. See the implementations in Boost.TypeTraits (http://boost.org) and Loki ([url]http://sourceforge.net/projects/loki-lib/)[/url]. They both have some tricks to make it work with VC++ 6. VC++ 6 is actually more advanced than Embedded VC++, or so I heard. Back to top jeff_d_harper@hotmail.com Guest Posted: Fri Oct 28, 2005 7:38 pm    Post subject: Re: Template to remove reference. I'd already checked out Boost. Unfortunately, it looks like it is not possible to remove a reference with boost unless the compiler supports partial template specialization. Or, a macro is used to setup type traits for user defined types. http://www.boost.org/doc/html/boost_typetraits/category.html#transform.broken_compiler_workarounds_ At your suggestion I looked at Loki. Unfortunately, it doesn't look like the TypeTraits<T>::ReferredType is implemented in the VC6 version of Loki. In fact, when I grepped the VC6 Loki header files for ReferredType, I found this comment: //TODOSGB None of the parameter types are defined inside of TypeTraits, e.g. PointeeType, ReferredType, etc... I will probably implement a solution similar to Boost's "broken compiler work around" where I use a macro to setup a type trait for all my UDTs. I look forward to the day when I no longer have to worry about how complete my compiler's template support is. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.