re PR c++/50545 ([C++0x][DR 1172] SFINAE does not handle an explicit type conversion (functional notation) with a braced-init-list well if target type is not dependent)

	PR c++/50545
	PR c++/51222
	* pt.c (instantiation_dependent_r): New.
	(instantiation_dependent_expression_p): New.
	(value_dependent_expression_p): Use it.  SCOPE_REF is always dependent.
	* semantics.c (finish_decltype_type): Use it.
	* cp-tree.h: Declare it.

From-SVN: r190830

3 files changed, 175 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/cpp0x/decltype40.C b/gcc/testsuite/g++.dg/cpp0x/decltype40.C
new file mode 100644
index 0000000..7933c95
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/decltype40.C
@@ -0,0 +1,101 @@
+// PR c++/51222
+// { dg-options -std=c++11 }
+
+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, class =
+  decltype(::delete ::new T(declval<U>()))
+>
+auto f(int) -> char;
+
+template<class, class>
+auto f(...) -> char(&)[2];
+
+template<class T, class =
+  decltype(::delete ::new T())
+>
+auto g(int) -> char;
+
+template<class>
+auto g(...) -> char(&)[2];
+
+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() = 0;
+};
+
+struct D1 {
+  D1() = delete;
+};
+
+struct D2 {
+  ~D2() = delete;
+};
+
+static_assert(sizeof(g<void>(0)) == 2, "Ouch");
+static_assert(sizeof(g<void()>(0)) == 2, "Ouch");
+static_assert(sizeof(g<void() const>(0)) == 2, "Ouch");
+static_assert(sizeof(g<A>(0)) == 2, "Ouch");
+static_assert(sizeof(g<D1>(0)) == 2, "Ouch");
+static_assert(sizeof(g<D2>(0)) == 2, "Ouch");
+static_assert(sizeof(g<int&>(0)) == 2, "Ouch");
+static_assert(sizeof(g<int&&>(0)) == 2, "Ouch");
+static_assert(sizeof(g<void(&)()>(0)) == 2, "Ouch");
+static_assert(sizeof(g<void(&&)()>(0)) == 2, "Ouch");
+static_assert(sizeof(f<void, void>(0)) == 2, "Ouch");
+static_assert(sizeof(f<void(), void()>(0)) == 2, "Ouch");
+static_assert(sizeof(f<void() const, void() const>(0)) == 2, "Ouch");
+static_assert(sizeof(f<int, void>(0)) == 2, "Ouch");
+static_assert(sizeof(f<void, int>(0)) == 2, "Ouch");
+static_assert(sizeof(f<C, void>(0)) == 2, "Ouch");
+static_assert(sizeof(f<C, int>(0)) == 2, "Ouch");
+static_assert(sizeof(f<int&, int&>(0)) == 2, "Ouch");
+static_assert(sizeof(f<int&&, int&&>(0)) == 2, "Ouch");
+static_assert(sizeof(f<void(&)(), void(&)()>(0)) == 2, "Ouch");
+static_assert(sizeof(f<void(&&)(), void(&&)()>(0)) == 2, "Ouch");
+
+static_assert(sizeof(g2<void>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<void()>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<void() const>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<A>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<D1>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<D2>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<int&>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<int&&>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<void(&)()>(0)) == 2, "Ouch");
+static_assert(sizeof(g2<void(&&)()>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<void, void>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<void(), void()>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<void() const, void() const>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<int, void>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<void, int>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<C, void>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<C, int>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<int&, int&>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<int&&, int&&>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<void(&)(), void(&)()>(0)) == 2, "Ouch");
+static_assert(sizeof(f2<void(&&)(), void(&&)()>(0)) == 2, "Ouch");
diff --git a/gcc/testsuite/g++.dg/cpp0x/decltype41.C b/gcc/testsuite/g++.dg/cpp0x/decltype41.C
new file mode 100644
index 0000000..1439e15
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/decltype41.C
@@ -0,0 +1,43 @@
+// Core 1273
+// { dg-do compile { target c++11 } }
+
+template <class T> struct C;
+template <class T> struct D;
+
+class A
+{
+  int i;
+  static int j;
+  friend struct C<int>;
+  friend struct D<int>;
+} a;
+
+class B
+{
+  int i;
+  static int j;
+  friend struct C<float>;
+  friend struct D<float>;
+} b;
+
+template <class T>
+struct C
+{
+  template <class U> decltype (a.i) f() { } // #1
+  template <class U> decltype (b.i) f() { } // #2
+};
+
+template <class T>
+struct D
+{
+  template <class U> decltype (A::j) f() { } // #1
+  template <class U> decltype (B::j) f() { } // #2
+};
+
+int main()
+{
+  C<int>().f<int>();     // calls #1
+  C<float>().f<float>(); // calls #2
+  D<int>().f<int>();     // calls #1
+  D<float>().f<float>(); // calls #2
+}
diff --git a/gcc/testsuite/g++.dg/cpp0x/decltype42.C b/gcc/testsuite/g++.dg/cpp0x/decltype42.C
new file mode 100644
index 0000000..6c1aa43
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/decltype42.C
@@ -0,0 +1,31 @@
+// PR c++/50545
+// { dg-do compile { target c++11 } }
+
+template< class T >
+T&& declval();
+
+// #1
+template< class T >
+auto f( int )
+  -> decltype( int{ declval<T>() } );
+
+// #2
+template< class >
+void f( ... );
+
+
+#define STATIC_ASSERT( ... ) static_assert( __VA_ARGS__, #__VA_ARGS__ )
+
+template< class T, class U >
+struct is_same {
+  static constexpr bool value = false;
+};
+
+template< class T >
+struct is_same<T, T> {
+  static constexpr bool value = true;
+};
+
+
+STATIC_ASSERT( is_same< decltype( f<int>(0) ),  int >::value );  // OK; f<int>(0) calls #1.
+STATIC_ASSERT( is_same< decltype( f<int*>(0) ), void >::value ); // static assertion fails; f<int*>(0) should call #2, because int{ (int*)0 } is ill-formed, but calls #1.