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76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
// Range v3 library
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//
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// Copyright Eric Niebler 2014-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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#include <list>
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#include <range/v3/core.hpp>
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#include <range/v3/view/counted.hpp>
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#include "../simple_test.hpp"
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#include "../test_utils.hpp"
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#include "../test_iterators.hpp"
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struct fortytwo_erator {
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using difference_type = int;
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using value_type = int;
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fortytwo_erator() = default;
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int operator*() const { return 42; }
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fortytwo_erator& operator++() { return *this; }
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void operator++(int) {}
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};
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int main()
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{
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using namespace ranges;
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std::cout << "\nTesting counted\n";
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{
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int rgi[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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auto rng = views::counted(ForwardIterator<int*>{rgi}, 10);
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rng.size();
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CPP_assert(sized_range<decltype(rng)> && view_<decltype(rng)>);
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auto i = rng.begin();
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auto b = i.base();
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auto c = i.count();
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decltype(i) j{b, c};
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::check_equal(rng, {1, 2, 3, 4, 5, 6, 7, 8, 9, 10});
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static_assert(std::is_same<decltype(i), counted_iterator<ForwardIterator<int*>>>::value, "");
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}
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{
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std::list<int> l;
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counted_iterator<std::list<int>::iterator> a(l.begin(), 0);
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counted_iterator<std::list<int>::const_iterator> b(l.begin(), 0);
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detail::ignore_unused(
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a-a,
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b-b,
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a-b,
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b-a);
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counted_iterator<char*> c(nullptr, 0);
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counted_iterator<char const*> d(nullptr, 0);
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detail::ignore_unused(
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c-c,
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d-d,
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c-d,
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d-c);
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}
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{
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// Regression test: ensure that we can post-increment a counted_iterator<I>
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// when decltype(declval<I &>()++) is void.
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CPP_assert(ranges::input_iterator<fortytwo_erator>);
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ranges::counted_iterator<fortytwo_erator> c{{}, 42};
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c++;
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}
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return ::test_result();
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}
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