[Bug c++/3471] gcc 3.01 reports error about a private copy constructor that shouldn't get called.

["austern at apple dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3471



------- Additional Comments From austern at apple dot com  2003-09-09 18:00 -------
I believe that this resolution is incorrect.  f.test(b) initializes a reference of type const foo& 
with a temporary, where the temporary was created via a user-defined  conversion from 
bar, foo::foo(bar).  The last bullet item in section 8.5.3/p5 of the standard (i.e. the bullet 
item just before par 6) says that the temporary is created "using the rules for a non-
reference copy initialization (8.5)".  8.5p14 says that non-reference copy initialization is 
done as if by doing a user-defined conversion and then making a copy.  It says that an 
implementation is permitted to elide the copy constructor, referring to clause 12.2 for 
details.  12.2 paragraph 1 makes it clear that even when the copy constructor is elided, 
the implementation is still required to check it for accessibility.

I've opened new bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12226 for the failure to 
check copy constructor accessibility when the copy constructor is optimized away.