https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93043
Bug ID: 93043
Summary: fails to compile comparison between pointer and
convertible to nullptr_t
Product: gcc
Version: 9.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gccbugbjorn at fahller dot se
Target Milestone: ---
Created attachment 47541
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47541&action=edit
Failing example program
For all versions of gcc, but specifically 9.2.1 and trunk 20191215, the
following program fails to compile:
#include <cstddef>
struct indirect_null {
inline operator std::nullptr_t() const;
};
int* pi = nullptr;
bool b = pi == indirect_null{};
The error message is:
bf :-) confuciusornis /tmp> g++-9 -std=c++17 t.cpp
t.cpp:8:13: error: no match for ‘operator==’ (operand types are ‘int*’ and
‘indirect_null’)
8 | bool b = pi == indirect_null{};
| ~~ ^~ ~~~~~~~~~~~~~~~
| | |
| int* indirect_null
bf :-( confuciusornis /tmp> g++-9 --version
g++-9 (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008
Copyright (C) 2019 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.
A more elaborate test program version can be found on
https://godbolt.org/z/aCerqy
which shows that the test works for user defined types with a matching
operator== as a member function, but not for a fundamental pointer type.
