https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116529
Bug ID: 116529
Summary: Construction of unique_ptr with reference type is
rejected because of auto_ptr constructor
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: luigighiron at gmail dot com
Target Milestone: ---
When constructing a unique_ptr with a reference type an error will occur in the
libstdc++ implementation due to the auto_ptr constructor attempting to form a
pointer to the reference type. For example:
#include<memory>
int main(){
struct deleter{
using pointer=int*;
void operator()(pointer p)const{
delete p;
}
};
std::unique_ptr<int&,deleter>u(new int);
}
libstdc++ rejects this program, libc++ and MSVC's STL allow it (when compiling
with C++17 or newer). The auto_ptr constructor was removed in C++17 along with
the rest of auto_ptr, this means that there shouldn't be any restrictions on
using a reference type when constructing a unique_ptr. I haven't seen any
restrictions on using a unique_ptr with a reference type so I assume that this
is OK (since C++17).
