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From: "daniel.kruegler at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51222] [C++11][SFINAE] Unevaluated combined delete new expression completely broken
Date: Mon, 21 Nov 2011 08:08:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51222

--- Comment #2 from Daniel Kr=C3=BCgler <daniel.kruegler at googlemail dot =
com> 2011-11-21 07:51:49 UTC ---
When fixing this problem, I suggest to add the following tests as well, whi=
ch
also fail currently (In previous builds sometimes one of these forms worked
when the other failed):

//---
template<class T>
struct add_rref {
  typedef T&& type;
};

template<>
struct add_rref<void> {
  typedef void type;
};

template<class T>
typename add_rref<T>::type declval();

template<class T, class U>
auto f2(int) -> decltype(::delete ::new T(declval<U>()), char());

template<class, class>
auto f2(...) -> char(&)[2];

template<class T>
auto g2(int) -> decltype(::delete ::new T(), char());

template<class>
auto g2(...) -> char(&)[2];

struct C { };

struct A {
  virtual ~A() =3D 0;
};

struct D1 {
  D1() =3D delete;
};

struct D2 {
  ~D2() =3D delete;
};

static_assert(sizeof(g2<void>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<void()>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<void() const>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<A>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<D1>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<D2>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<int&>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<int&&>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<void(&)()>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(g2<void(&&)()>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<void, void>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<void(), void()>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<void() const, void() const>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<int, void>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<void, int>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<C, void>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<C, int>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<int&, int&>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<int&&, int&&>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<void(&)(), void(&)()>(0)) =3D=3D 2, "Ouch");
static_assert(sizeof(f2<void(&&)(), void(&&)()>(0)) =3D=3D 2, "Ouch");
//---