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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <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);
}
#if TEST_STD_VER > 14
template <class It>
constexpr bool
constexpr_test(It first, It last, typename std::iterator_traits<It>::difference_type x)
{
return std::distance(first, last) == x;
}
#endif
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);
}
#if TEST_STD_VER > 14
{
constexpr const char* s = "1234567890";
static_assert( constexpr_test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), 10), "");
static_assert( constexpr_test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+10), 10), "");
static_assert( constexpr_test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+10), 10), "");
static_assert( constexpr_test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+10), 10), "");
static_assert( constexpr_test(s, s+10, 10), "");
}
#endif
}
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