https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94564
Bug ID: 94564
Summary: C++20: Three-way comparison between pointer and
nullptr accepted
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: daniel.kruegler at googlemail dot com
Target Milestone: ---
The following program is accepted when compiling against C++20, but should be
rejected, because the C++20 working draft does not support three-way comparison
between pointer and std::nullptr_t (See [expr.spaceship] p6):
Compiler options:
-Wall -Wextra -pedantic -std=c++20
//-------------------
#include <compare>
template<class T, decltype((((T*) 0) <=> nullptr), true) = false>
void test(T*)
{
}
int main()
{
test((int*)(nullptr));
}
//-------------------
