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Fix PR39619 - iterator_traits isn't SFINAE-friendly enough. Thanks to Eric for the report

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@346738 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-11-13 05:33:31 +00:00
parent 94664a1ad8
commit 3870a97d86
3 changed files with 141 additions and 1 deletions
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19
include/iterator
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@@ -437,6 +437,23 @@ struct _LIBCPP_TEMPLATE_VIS forward_iterator_tag : public input_iterator_t
struct _LIBCPP_TEMPLATE_VIS bidirectional_iterator_tag : public forward_iterator_tag {};
struct _LIBCPP_TEMPLATE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {};
template <class _Tp>
struct __has_iterator_typedefs
{
private:
struct __two {char __lx; char __lxx;};
template <class _Up> static __two __test(...);
template <class _Up> static char __test(typename std::__void_t<typename _Up::iterator_category>::type* = 0,
typename std::__void_t<typename _Up::difference_type>::type* = 0,
typename std::__void_t<typename _Up::value_type>::type* = 0,
typename std::__void_t<typename _Up::reference>::type* = 0,
typename std::__void_t<typename _Up::pointer>::type* = 0
);
public:
static const bool value = sizeof(__test<_Tp>(0,0,0,0,0)) == 1;
};
template <class _Tp>
struct __has_iterator_category
{
@@ -479,7 +496,7 @@ struct __iterator_traits<_Iter, true>
template <class _Iter>
struct _LIBCPP_TEMPLATE_VIS iterator_traits
: __iterator_traits<_Iter, __has_iterator_category<_Iter>::value> {};
: __iterator_traits<_Iter, __has_iterator_typedefs<_Iter>::value> {};
template<class _Tp>
struct _LIBCPP_TEMPLATE_VIS iterator_traits<_Tp*>