//===----------------------------------------------------------------------===//
//
//                     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.
//
//===----------------------------------------------------------------------===//

// <forward_list>

// iterator       begin();
// iterator       end();
// const_iterator begin()  const;
// const_iterator end()    const;
// const_iterator cbegin() const;
// const_iterator cend()   const;

#include <forward_list>
#include <cassert>
#include <iterator>

int main()
{
    {
        typedef int T;
        typedef std::forward_list<T> C;
        C c;
        C::iterator i = c.begin();
        C::iterator j = c.end();
        assert(std::distance(i, j) == 0);
        assert(i == j);
    }
    {
        typedef int T;
        typedef std::forward_list<T> C;
        const C c;
        C::const_iterator i = c.begin();
        C::const_iterator j = c.end();
        assert(std::distance(i, j) == 0);
        assert(i == j);
    }
    {
        typedef int T;
        typedef std::forward_list<T> C;
        C c;
        C::const_iterator i = c.cbegin();
        C::const_iterator j = c.cend();
        assert(std::distance(i, j) == 0);
        assert(i == j);
        assert(i == c.end());
    }
    {
        typedef int T;
        typedef std::forward_list<T> C;
        const T t[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
        C c(std::begin(t), std::end(t));
        C::iterator i = c.begin();
        assert(*i == 0);
        ++i;
        assert(*i == 1);
        *i = 10;
        assert(*i == 10);
        assert(std::distance(c.begin(), c.end()) == 10);
    }
    {
        typedef int T;
        typedef std::forward_list<T> C;
        C::iterator i;
        C::const_iterator j;
    }
}