commit 77b60d23c71206b7ac3c9d9817db3787383ea2fd
Author: Jason Merrill <jason@redhat.com>
Date: Mon Jun 4 16:51:15 2018 +0200
PR c++/61806 - missed SFINAE with partial specialization.
* cp-tree.h (deferring_access_check_sentinel): Add deferring_kind
parameter to constructor.
* pt.c (instantiate_class_template_1): Enable access checking
before call to most_specialized_partial_spec.
@@ -6807,9 +6807,9 @@ extern bool perform_or_defer_access_check (tree, tree, tree,
struct deferring_access_check_sentinel
{
- deferring_access_check_sentinel ()
+ deferring_access_check_sentinel (enum deferring_kind kind = dk_deferred)
{
- push_deferring_access_checks (dk_deferred);
+ push_deferring_access_checks (kind);
}
~deferring_access_check_sentinel ()
{
@@ -10850,6 +10850,10 @@ instantiate_class_template_1 (tree type)
/* Mark the type as in the process of being defined. */
TYPE_BEING_DEFINED (type) = 1;
+ /* We may be in the middle of deferred access check. Disable
+ it now. */
+ deferring_access_check_sentinel acs (dk_no_deferred);
+
/* Determine what specialization of the original template to
instantiate. */
t = most_specialized_partial_spec (type, tf_warning_or_error);
@@ -10889,10 +10893,6 @@ instantiate_class_template_1 (tree type)
if (! push_tinst_level (type))
return type;
- /* We may be in the middle of deferred access check. Disable
- it now. */
- push_deferring_access_checks (dk_no_deferred);
-
int saved_unevaluated_operand = cp_unevaluated_operand;
int saved_inhibit_evaluation_warnings = c_inhibit_evaluation_warnings;
@@ -11373,7 +11373,6 @@ instantiate_class_template_1 (tree type)
maximum_field_alignment = saved_maximum_field_alignment;
if (!fn_context)
pop_from_top_level ();
- pop_deferring_access_checks ();
pop_tinst_level ();
/* The vtable for a template class can be emitted in any translation
new file mode 100644
@@ -0,0 +1,39 @@
+// PR c++/61806
+// { dg-do compile { target c++11 } }
+
+struct true_type
+{
+ static const bool value = true;
+};
+
+struct false_type
+{
+ static const bool value = false;
+};
+
+template<class T>
+T&& declval();
+
+template<typename> struct check { typedef void type; };
+
+template<typename T, typename Enable = void>
+struct has_public_f : false_type {};
+
+template<typename T>
+struct has_public_f<
+ T,
+ typename check<
+ decltype(
+ declval<T&>().f()
+ )
+ >::type
+> : true_type {};
+
+
+struct Spub { public: void f(); };
+struct Spriv { private: void f(); };
+
+static_assert( has_public_f<Spub>::value, "Ouch");
+static_assert(!has_public_f<Spriv>::value, "Ouch");
+
+int main() {}