Core 1232

Core 1232
	* call.c (build_array_conv): New.
	(implicit_conversion): Use it.

From-SVN: r171614

gcc/cp/ChangeLog

@@ -1,5 +1,9 @@
 2011-03-28  Jason Merrill  <jason@redhat.com>
 
+	Core 1232
+	* call.c (build_array_conv): New.
+	(implicit_conversion): Use it.
+
 	* call.c (reference_binding): Allow direct binding to an array
 	rvalue.
 

gcc/cp/call.c

@@ -801,6 +801,53 @@ build_aggr_conv (tree type, tree ctor, int flags)
   return c;
 }
 
+/* Represent a conversion from CTOR, a braced-init-list, to TYPE, an
+   array type, if such a conversion is possible.  */
+
+static conversion *
+build_array_conv (tree type, tree ctor, int flags)
+{
+  conversion *c;
+  unsigned HOST_WIDE_INT len = CONSTRUCTOR_NELTS (ctor);
+  tree elttype = TREE_TYPE (type);
+  unsigned i;
+  tree val;
+  bool bad = false;
+  bool user = false;
+  enum conversion_rank rank = cr_exact;
+
+  if (TYPE_DOMAIN (type))
+    {
+      unsigned HOST_WIDE_INT alen = tree_low_cst (array_type_nelts_top (type), 1);
+      if (alen < len)
+	return NULL;
+    }
+
+  FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (ctor), i, val)
+    {
+      conversion *sub
+	= implicit_conversion (elttype, TREE_TYPE (val), val,
+			       false, flags);
+      if (sub == NULL)
+	return NULL;
+
+      if (sub->rank > rank)
+	rank = sub->rank;
+      if (sub->user_conv_p)
+	user = true;
+      if (sub->bad_p)
+	bad = true;
+    }
+
+  c = alloc_conversion (ck_aggr);
+  c->type = type;
+  c->rank = rank;
+  c->user_conv_p = user;
+  c->bad_p = bad;
+  c->u.next = NULL;
+  return c;
+}
+
 /* Build a representation of the identity conversion from EXPR to
    itself.  The TYPE should match the type of EXPR, if EXPR is non-NULL.  */
 
@@ -1623,6 +1670,8 @@ implicit_conversion (tree to, tree from, tree expr, bool c_cast_p,
 	      return conv;
 	    }
 	}
+      else if (TREE_CODE (to) == ARRAY_TYPE)
+	return build_array_conv (to, expr, flags);
     }
 
   if (expr != NULL_TREE

gcc/testsuite/ChangeLog

@@ -1,5 +1,7 @@
 2011-03-28  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/initlist-array2.C: New.
+
 	* g++.dg/cpp0x/initlist-array1.C: New.
 
 	* g++.dg/cpp0x/constexpr-compound.C: New.

gcc/testsuite/g++.dg/cpp0x/initlist-array2.C

@@ -0,0 +1,12 @@
+// { dg-options -std=c++0x }
+
+typedef int IA[2];
+typedef double DA[2];
+
+void f(const IA&) { }
+void f(const DA&);
+
+int main()
+{
+  f({1,2});
+}