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From: andre@kiwisound.de To: gcc-gnats@gcc.gnu.org Subject: c++/8821: gcc 3.2 problem with overloaded inherited operator Date: Thu, 05 Dec 2002 05:06:00 -0000 [thread overview] Message-ID: <20021205125608.2219.qmail@sources.redhat.com> (raw) >Number: 8821 >Category: c++ >Synopsis: gcc 3.2 problem with overloaded inherited operator >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: rejects-legal >Submitter-Id: net >Arrival-Date: Thu Dec 05 05:06:00 PST 2002 >Closed-Date: >Last-Modified: >Originator: Andre Mueller >Release: gcc version 3.2 >Organization: >Environment: Linux version 2.4.19-4GB >Description: A operator with a user class from a base class A will not be found if a derived class B overloads this operator. > g++ tst.cpp tst.cpp: In function `int main(int, char**)': tst.cpp:16: no match for `B& << Z&' operator tst.cpp:10: candidates are: void B::operator<<(int) >How-To-Repeat: class Z { }; class A { public: void operator << ( const Z & ) { } }; class B : public A { public: void operator << ( int ) { } }; int main( int , char ** ) { B b; Z z; b << z; // Oops!? Why is it not possible to compile this? return 0; } >Fix: An explicit downcast is necessary: Replace the line b << z with static_cast<A&>(b) << z; >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-12-05 13:06 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-12-05 5:06 andre [this message] 2002-12-10 14:28 bangerth 2002-12-11 1:42 reichelt 2002-12-11 7:16 Nathan Sidwell 2002-12-11 7:26 Wolfgang Bangerth
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