final/test/iterators/iterator.primitives/iterator.operations/distance.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>

// template <InputIterator Iter>
//   Iter::difference_type
//   distance(Iter first, Iter last);
//
// template <RandomAccessIterator Iter>
//   Iter::difference_type
//   distance(Iter first, Iter last);

#include <iterator>
#include <cassert>

#include "test_iterators.h"

template <class It>
void
test(It first, It last, typename std::iterator_traits<It>::difference_type x)
{
    assert(std::distance(first, last) == x);
}

int main()
{
    const char* s = "1234567890";
    test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), 10);
    test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+10), 10);
    test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+10), 10);
    test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+10), 10);
    test(s, s+10, 10);
}