Files
libcxx/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
Stephan T. Lavavej b859a78a6f [libcxx] [test] Rename _Up to U, etc. NFCI.
This improves readability and (theoretically) improves portability,
as _Ugly names are reserved.

This performs additional de-uglification, so all of these tests
follow the example of iterator.traits/empty.pass.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@310761 91177308-0d34-0410-b5e6-96231b3b80d8
2017-08-11 20:54:09 +00:00

39 lines
886 B
C++

//===----------------------------------------------------------------------===//
//
// 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 T>
struct has_value_type
{
private:
struct two {char lx; char lxx;};
template <class U> static two test(...);
template <class U> static char test(typename U::value_type* = 0);
public:
static const bool value = sizeof(test<T>(0)) == 1;
};
int main()
{
typedef std::iterator_traits<not_an_iterator> It;
static_assert(!(has_value_type<It>::value), "");
}