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From: mike_harris@filemaker.com To: gcc-gnats@gcc.gnu.org Cc: kristof_subryan@filemaker.com Subject: c++/5937: g++ 3.0.2 does not allow return of class constructor Date: Wed, 13 Mar 2002 09:16:00 -0000 [thread overview] Message-ID: <20020313171058.9297.qmail@sources.redhat.com> (raw) >Number: 5937 >Category: c++ >Synopsis: g++ 3.0.2 does not allow return of class constructor >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: rejects-legal >Submitter-Id: net >Arrival-Date: Wed Mar 13 09:16:01 PST 2002 >Closed-Date: >Last-Modified: >Originator: Mike Harris >Release: gcc version 3.0.2 >Organization: >Environment: GNU/Linux 2.4.3 (Intel i686) Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.0.2/specs Configured with: ../gcc-3.0.2/configure --prefix=/usr --enable-shared --enable-threads Thread model: posix gcc version 3.0.2 >Description: g++ will not allow a return of a class constructor which is marked explicit without the class copy constructor public. I do not want uncessary copies of the class to occur, therefore, the copy constructor and assignment operator are private. I want all constructions to be explicit, which "return X(d);" is. Interestingly, when the copy constructor is public, the code compiles, however, the when it is run, the copy constructor is never called. Compiler Output: [lotus@hyperion trial]$ g++ -o explicit_test explicit_test.cpp explicit_test.cpp: In function `X f(int)': explicit_test.cpp:15: `X::X(const X&)' is private explicit_test.cpp:19: within this context explicit_test.cpp: In function `int main()': explicit_test.cpp:15: `X::X(const X&)' is private explicit_test.cpp:23: within this context >How-To-Repeat: (not sure if Galeon supports file upload...) #include <iostream> class X { public: explicit X(int d) : mData(d) { } ~X( ) { }; int mData; private: X( const X& ) { std::cout << "Copy called\n"; } X& operator=( const X& ) { } }; X f(int d) { return X(d); } int main( void ) { X tmpX = f(10); std::cout << "tmpX: " << tmpX.mData << std::endl; return 0; } >Fix: The pre-processor (or whichever component it really is) should not complain about not having a copy constructor when returning a class constructor. >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: text/cpp; name="explicit_test.cpp" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="explicit_test.cpp" CiNpbmNsdWRlIDxpb3N0cmVhbT4KCmNsYXNzIFggCnsKcHVibGljOgoKCWV4cGxpY2l0IFgoaW50 IGQpIDogbURhdGEoZCkgeyAgfQoJflgoICkgeyB9OwoJCglpbnQgbURhdGE7Cgpwcml2YXRlOgoK CVgoIGNvbnN0IFgmICkgeyBzdGQ6OmNvdXQgPDwgIkNvcHkgY2FsbGVkXG4iOyB9CglYJiBvcGVy YXRvcj0oIGNvbnN0IFgmICkgeyB9Cn07CgpYIGYoaW50IGQpIHsgcmV0dXJuIFgoZCk7IH0KCmlu dCBtYWluKCB2b2lkICkKewoJWCB0bXBYID0gZigxMCk7CgoJc3RkOjpjb3V0IDw8ICJ0bXBYOiAi IDw8IHRtcFgubURhdGEgPDwgc3RkOjplbmRsOyAKCglyZXR1cm4gMDsKfQo=
next reply other threads:[~2002-03-13 17:16 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-03-13 9:16 mike_harris [this message] 2002-04-25 6:46 nathan
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