minus.pass.cpp   [plain text]

//===----------------------------------------------------------------------===//
//
//                     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>

// move_iterator

// template <RandomAccessIterator Iter1, RandomAccessIterator Iter2>
//   requires HasMinus<Iter1, Iter2>
//   auto
//   operator-(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y)
//   -> decltype(x.base() - y.base());

#include <iterator>
#include <cassert>

#include "../../../../iterators.h"

template <class It>
void
test(It l, It r, typename std::iterator_traits<It>::difference_type x)
{
    const std::move_iterator<It> r1(l);
    const std::move_iterator<It> r2(r);
    assert(r1 - r2 == x);
}

int main()
{
    char s[] = "1234567890";
    test(random_access_iterator<char*>(s+5), random_access_iterator<char*>(s), 5);
    test(s+5, s, 5);
}