| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <iterator> |
| |
| // template<class NotAnIterator> |
| // struct iterator_traits |
| // { |
| // }; |
| |
| #include <iterator> |
| |
| struct not_an_iterator |
| { |
| }; |
| |
| template <class _Tp> |
| struct has_value_type |
| { |
| private: |
| struct two {char lx; char lxx;}; |
| template <class _Up> static two test(...); |
| template <class _Up> static char test(typename _Up::value_type* = 0); |
| public: |
| static const bool value = sizeof(test<_Tp>(0)) == 1; |
| }; |
| |
| int main() |
| { |
| typedef std::iterator_traits<not_an_iterator> It; |
| static_assert(!(has_value_type<It>::value), ""); |
| } |