http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56373
Bug #: 56373
Summary: -Wzero-as-null-pointer-constant: does not catch issues
with smart pointers
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: akim.demai...@gmail.com
Hi all,
Sorry if this report is bogus. I would expect GCC to complain about the
following uses of 0 instead of nullptr, but it does not.
$ cat foo.cc
#include <memory>
struct foo {};
int main ()
{
std::shared_ptr<foo> a = 0;
std::shared_ptr<foo> b(0);
std::shared_ptr<foo> c{0};
foo *d = 0;
}
$ g++-mp-4.8 -std=c++11 -Wall -Wzero-as-null-pointer-constant /tmp/foo.cc
/tmp/foo.cc: In function 'int main()':
/tmp/foo.cc:9:12: warning: zero as null pointer constant
[-Wzero-as-null-pointer-constant]
foo *d = 0;
^
/tmp/foo.cc:9:8: warning: unused variable 'd' [-Wunused-variable]
foo *d = 0;
^
$ g++-mp-4.8 --version
g++-mp-4.8 (MacPorts gcc48 4.8-20130210_0) 4.8.0 20130210 (experimental)
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
It's also a bit sad that only d is diagnosed as useless, although I do
understand that the shared_ptr has a constructor and a destructor that use
it.
Cheers!
