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//===----------------------------------------------------------------------===//
//
// 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>
// reverse_iterator
// constexpr reference operator*() const;
//
// constexpr in C++17
// Be sure to respect LWG 198:
// http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#198
// LWG 198 was superseded by LWG 2360
// http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2360
#include <iterator>
#include <cassert>
#include "test_macros.h"
class A
{
int data_;
public:
A() : data_(1) {}
~A() {data_ = -1;}
friend bool operator==(const A& x, const A& y)
{return x.data_ == y.data_;}
};
template <class It>
void
test(It i, typename std::iterator_traits<It>::value_type x)
{
std::reverse_iterator<It> r(i);
assert(*r == x);
}
int main()
{
A a;
test(&a+1, A());
#if TEST_STD_VER > 14
{
constexpr const char *p = "123456789";
typedef std::reverse_iterator<const char *> RI;
constexpr RI it1 = std::make_reverse_iterator(p+1);
constexpr RI it2 = std::make_reverse_iterator(p+2);
static_assert(*it1 == p[0], "");
static_assert(*it2 == p[1], "");
}
#endif
}
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