libcxx/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opref/op_arrow.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     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

// pointer operator->() const;

// 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// LWG 198 was superseded by LWG 2360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 <list>
#include <cassert>

class A
{
    int data_;
public:
    A() : data_(1) {}
    ~A() {data_ = -1;}

    int get() const {return data_;}

    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->get() == x.get());
}

class B
{
    int data_;
public:
    B(int d=1) : data_(d) {}
    ~B() {data_ = -1;}

    int get() const {return data_;}

    friend bool operator==(const B& x, const B& y)
        {return x.data_ == y.data_;}
    const B *operator&() const { return nullptr; }
    B       *operator&()       { return nullptr; }
};

int main()
{
    A a;
    test(&a+1, A());
    
    {
    std::list<B> l;
    l.push_back(B(0));
    l.push_back(B(1));
    l.push_back(B(2));
    
    {
    std::list<B>::const_iterator i = l.begin();
    assert ( i->get() == 0 );  ++i;
    assert ( i->get() == 1 );  ++i;
    assert ( i->get() == 2 );  ++i;
    assert ( i == l.end ());
    }
    
    {
    std::list<B>::const_reverse_iterator ri = l.rbegin();
    assert ( ri->get() == 2 );  ++ri;
    assert ( ri->get() == 1 );  ++ri;
    assert ( ri->get() == 0 );  ++ri;
    assert ( ri == l.rend ());
    }
    }
}