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From: "lichtwerk dot x at laposte dot net" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/23950] New: Two-phase name lookup crash with "using" a static const integer from a base class as template parameter Date: Sun, 18 Sep 2005 15:43:00 -0000 [thread overview] Message-ID: <20050918154321.23950.lichtwerk.x@laposte.net> (raw) Accessing members of base classes depending on template parameters from derived classes has to be done by postponing the name lookup onte the second phase of the standard c++ two phase name lookup (if I'm right about that). This means, one has to use dependent types, so you have to use scope resolution, this-> or a using declaration in order to access the member of the base class. Example (this works): template<typename T> class Base { static const int i = 0; }; template<typename T> class Derived : public Base<T> { // For two phase name lookup. using Base<T>::i; int foo() const { return i; } }; In order not to obfuscate bigger classes I heavily used using declarations as shown in the example above (instead of writing "return Base<T>::i;"). However using a static const integral out of a base class using a using declaration as a template parameter resulted in an internal compiler error: internal compiler error: in uses_template_parms, at cp/pt.c:4948 To reproduce the error compile this piece of code: template<int i> class X { }; template<typename T> class Base { static const int i = 0; }; template<typename T> class Derived : public Base<T> { // For two phase name lookup. using Base<T>::i; X<i> member; }; If I don't use a using declaration but write X<Base<T>::i> member; instead of using Base<T>::i; X<i> member; it works, though. Thanks in advance I'm using g++ 4.0.0 on Windows using these files http://www.thisiscool.com/gcc_mingw.htm#gcj40 However, I have exactly the same internal compiler error using MinGW's g++ 3.4.2. -- Summary: Two-phase name lookup crash with "using" a static const integer from a base class as template parameter Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: lichtwerk dot x at laposte dot net CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23950
next reply other threads:[~2005-09-18 15:43 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-09-18 15:43 lichtwerk dot x at laposte dot net [this message] 2005-09-18 16:46 ` [Bug c++/23950] [3.4 Regression] " pinskia at gcc dot gnu dot org
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