https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86646
Bug ID: 86646
Summary: Special member function 'cannot be defaulted' if type
alias is used
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: programmer at posteo dot de
Target Milestone: ---
GCC 7.3.0 (as well as 8.1 and 9.0 from godbolt.org) fails to compile the
following code:
//---
template<int N_>
struct Foo {
static constexpr int N = N_;// this indirection causes the error
using Self = Foo<N>;
Foo(const Self&) = default;
};
//---
The error message reads
> file.cpp:6:22: error: ‘Foo<N_>::Foo(const Self&)’ cannot be defaulted
I used the following command line to obtain that error message:
> g++ -Wall -Wextra -std=c++11 file.cpp
