January 2007 - openSUSE Programming - openSUSE Mailing Lists

Re: [opensuse-programming] Question on C++ and STL
by Jerry Feldman 22 Jan '07

22 Jan '07

On Monday 22 January 2007 10:15 +0100, Andreas.Schallenberg(a)eurobild.com wrote: > I had this in mind: > > template< class X > > class Y > { > typename std::list< T >::iterator xyz; > ... Thanks, This worked in my test case. For some reason, I had a brain fart and did not think of this even though I've seen it before. -- Jerry Feldman <gaf(a)blu.org> Boston Linux and Unix http://www.blu.org -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. --------------------------------------------------------------------- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org For additional commands, e-mail: opensuse-programming+help(a)opensuse.org

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Re: [opensuse-programming] Question on C++ and STL
by Jerry Feldman 22 Jan '07

22 Jan '07

On Monday 22 January 2007 10:15 +0100, Andreas.Schallenberg(a)eurobild.com wrote: > I had this in mind: > > template< class X > > class Y > { > typename std::list< T >::iterator xyz; > ... Thanks, This worked in my test case. For some reason, I had a brain fart and did not think of this even though I've seen it before. -- Jerry Feldman <gaf(a)blu.org> Associate Director Boston Linux and Unix http://www.blu.org --------------------------------------------------------------------- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org For additional commands, e-mail: opensuse-programming+help(a)opensuse.org

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Re: [opensuse-programming] Question on C++ and STL
by Jerry Feldman 22 Jan '07

22 Jan '07

On Sun, 21 Jan 2007 22:13:52 +0100 Volker <volker(a)openbios.org> wrote: > > Am Sonntag, 21. Januar 2007 17:57 schrieb Jerry Feldman: > > > containertest.cc: In member function ‘void MyClass<T>::erase(size_t)’: > > > containertest.cc:13: error: expected `;' before ‘it’ > > > Note: I've included both <list> and <iterator>. > > > > > You must define that method in the header-file. The compiler can't generate > > code unless it knows the actual type... > > So did you try moving the method > void MyClass<T>::erase(size_t n) > { > std::list<T>::iterator it; > ... > } > into the *header*file where your class definition is Yes. That's exactly where it was in the original. My example is simply a single C++ file, with the erase function defined inline within the class definition. -- Jerry Feldman <gaf(a)blu.org> Boston Linux and Unix user group http://www.blu.org PGP key id:C5061EA9 PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9

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[opensuse-programming] Question on C++ and STL
by Jerry Feldman 21 Jan '07

21 Jan '07

I have a template class that contains a container: template <class T> class MyClass { : private: std::list<T> ilist; }; I have no problem accessing the STL container using subscript, but I am unable to declare an iterator, as an example: void MyClass<T>::erase(size_t n) { std::list<T>::iterator it; ... g++ gives me an error: containertest.cc: In member function ‘void MyClass<T>::erase(size_t)’: containertest.cc:13: error: expected `;' before ‘it’ Note: I've included both <list> and <iterator>. Now if I declare something like: std::list<double>::iterator it; or std::list<std::string>::iterator it; Everything builds. One possible solution is to inherit the list, but I wanted to avoid inheriting STL containers. -- Jerry Feldman <gaf(a)blu.org> Boston Linux and Unix user group http://www.blu.org PGP key id:C5061EA9 PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9

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[opensuse-programming] Question on C++ and STL
by Jerry Feldman 21 Jan '07

21 Jan '07

I have a template class that contains a container: template <class T> class MyClass { : private: std::list<T> ilist; }; I have no problem accessing the STL container using subscript, but I am unable to declare an iterator, as an example: void MyClass<T>::erase(size_t n) { std::list<T>::iterator it; ... g++ gives me an error: containertest.cc: In member function ‘void MyClass<T>::erase(size_t)’: containertest.cc:13: error: expected `;' before ‘it’ Note: I've included both <list> and <iterator>. Now if I declare something like: std::list<double>::iterator it; or std::list<std::string>::iterator it; Everything builds. One possible solution is to inherit the list, but I wanted to avoid inheriting STL containers. -- Jerry Feldman <gaf(a)blu.org> Boston Linux and Unix user group http://www.blu.org PGP key id:C5061EA9 PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9

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