https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109114
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
But this works:
```
struct a
{
a() = delete;
a(const a&) = default;
int x;
char y;
};
struct b
{
b() = delete;
b(const b&) = default;
char y;
};
template <typename ...T>
struct Callables : T ... {
Callables(T ...t) : T(t) ... {}
};
void f() {
static_assert(sizeof(Callables<a,b>) == 12);
}
```
For both GCC and LLVM. The thing is the default constructor is not only deleted
but it should also be private .... Once you do that like:
```
struct a
{
a() = delete;
a(const a&) = default;
private:
int x;
char y;
};
struct b
{
b() = delete;
b(const b&) = default;
private:
char y1;
};
template <typename ...T>
struct Callables : T ... {
Callables(T ...t) : T(t) ... {}
};
void f() {
static_assert(sizeof(Callables<a,b>) == 8);
}
```
It becomes 8.
