SFINAE __bit_iterator such that it will only get instantiated with a container that has the nested type __storage_type. This prevents accidental instantiation such as in http://llvm.org/bugs/show_bug.cgi?id=12755. This fixes http://llvm.org/bugs/show_bug.cgi?id=12755.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@156308 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__bit_reference b/include/__bit_reference
index 906b9da..bc34555 100644
--- a/include/__bit_reference
+++ b/include/__bit_reference
@@ -22,7 +22,7 @@
_LIBCPP_BEGIN_NAMESPACE_STD
-template <class _Cp, bool _IsConst> class __bit_iterator;
+template <class _Cp, bool _IsConst, typename _Cp::__storage_type = 0> class __bit_iterator;
template <class _Cp> class __bit_const_reference;
template <class _Tp>
@@ -1057,7 +1057,8 @@
return __equal_unaligned(__first1, __last1, __first2);
}
-template <class _Cp, bool _IsConst>
+template <class _Cp, bool _IsConst,
+ typename _Cp::__storage_type>
class __bit_iterator
{
public:
