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From: prewett@pacific.mps.ohio-state.edu To: gcc-gnats@gcc.gnu.org Subject: c++/3390: Can't pass a reference to temporary objects Date: Sat, 23 Jun 2001 14:06:00 -0000 [thread overview] Message-ID: <20010623205806.32085.qmail@sourceware.cygnus.com> (raw) >Number: 3390 >Category: c++ >Synopsis: Can't pass a reference to temporary objects >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: rejects-legal >Submitter-Id: net >Arrival-Date: Sat Jun 23 14:06:01 PDT 2001 >Closed-Date: >Last-Modified: >Originator: Geoff Prewett >Release: gcc-3.0 >Organization: >Environment: Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.0/specs Configured with: ../gcc-3.0/configure Thread model: single gcc version 3.0 GNU CPP version 3.0 (cpplib) (i386 Linux/ELF) GNU C++ version 3.0 (i686-pc-linux-gnu) compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81). >Description: Gcc-3.0 does not appear to allow references to temporary objects. This makes it rather inconvenient to do: class Vector { ... }; void Munge(Vector& arg1, Vector& arg2, Vector& arg3); { Vector x, y; Munge(x + y, x - y, x + x); } This is very similar to bug report 3230. >How-To-Repeat: test.cpp: --------------------------------------------------------------------- int invert(int& x) { return(-x); } int problem() { int x = -5, y = 5, z; invert(x + y); // error z = x + y; // works invert(z); } --------------------------------------------------------------------- > gcc -v -save-temp test.cpp Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.0/specs gcc: unrecognized option `-save-temp' Configured with: ../gcc-3.0/configure Thread model: single gcc version 3.0 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.0/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=0 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ test.cpp -D__GNUG__=3 -D__GXX_DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase test.cpp -version -o /tmp/ccxreRzz.s GNU CPP version 3.0 (cpplib) (i386 Linux/ELF) GNU C++ version 3.0 (i686-pc-linux-gnu) compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-81). ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include/g++-v3 /usr/local/include/g++-v3/i686-pc-linux-gnu /usr/local/include/g++-v3/backward /usr/local/include /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.0/include /usr/include End of search list. test.cpp: In function `int problem()': test.cpp:10: could not convert `(x + y)' to `int&' test.cpp:2: in passing argument 1 of `int invert(int&)' >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2001-06-23 14:06 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2001-06-23 14:06 prewett [this message] 2001-06-26 13:33 aoliva
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