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From: jdonner@schedsys.com To: gcc-gnats@gcc.gnu.org Subject: c++/6079: Access error message discrepancy between template & plain class Date: Wed, 27 Mar 2002 20:46:00 -0000 [thread overview] Message-ID: <20020328044054.30003.qmail@sources.redhat.com> (raw) >Number: 6079 >Category: c++ >Synopsis: Access error message discrepancy between template & plain class >Confidential: no >Severity: non-critical >Priority: low >Responsible: unassigned >State: open >Class: change-request >Submitter-Id: net >Arrival-Date: Wed Mar 27 20:46:01 PST 2002 >Closed-Date: >Last-Modified: >Originator: JDonner >Release: gcc 3.0.4 >Organization: >Environment: Reading specs from /usr/local/gcc304/lib/gcc-lib/i686-pc-linux-gnu/3.0.4/specs Configured with: /home/jdonner/mk304/gcc-3.0.4/configure --prefix=/usr/local/gcc304 --enable-threads Thread model: posix gcc version 3.0.4 >Description: In some circumstances g++ doesn't warn about a hidden type as directly as in others. // badtypedef.cpp #if defined(CASE1) # define TMPL_ERR_MSG #elif defined(CASE2) # define TMPL_ERR_MSG # define TMPL_ERR_HELPER #endif struct Highup{Highup() {}}; class Base : public Highup { typedef Highup Inherited; struct Secret{}; public: Base() : Inherited() {} }; #ifdef TMPL_ERR_MSG template <class SomeT> #endif struct Derived : public Base { Derived(int x) : Inherited() { #ifdef TMPL_ERR_HELPER Secret s; #endif } }; int main() { Derived<int> d(3); } /////////////////////////////////////// -- Normal case; jdonner@deathstar ~> g++ badtypedef.cpp badtypedef.cpp: In constructor `Derived::Derived(int)': badtypedef.cpp:11: `typedef struct Highup Base::Inherited' is private badtypedef.cpp:21: within this context -- Making Derived a template, g++ no longer says explicitly that -- 'Inherited' is private; jdonner@deathstar ~> g++ -DCASE1 badtypedef.cpp badtypedef.cpp: In constructor `Derived<SomeT>::Derived(int) [with SomeT = int]': badtypedef.cpp:28: instantiated from here badtypedef.cpp:21: `Highup' is not an immediate base class of `Derived<int>' -- But referring to another hidden type restores the message about 'Inherited'. jdonner@deathstar ~> g++ -DCASE2 badtypedef.cpp badtypedef.cpp: In constructor `Derived<SomeT>::Derived(int)': badtypedef.cpp:12: `struct Base::Secret' is private badtypedef.cpp:23: within this context badtypedef.cpp:11: `typedef struct Highup Base::Inherited' is private badtypedef.cpp:23: within this context badtypedef.cpp: In constructor `Derived<SomeT>::Derived(int) [with SomeT = int]': badtypedef.cpp:28: instantiated from here badtypedef.cpp:21: `Highup' is not an immediate base class of `Derived<int>' g++ 2.95 does the same thing except CASE2 is no different from CASE1. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-03-28 4:46 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-03-27 20:46 jdonner [this message] 2002-09-15 11:36 nathan 2003-01-22 21:24 bangerth
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