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104 lines
3.5 KiB
C++
104 lines
3.5 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 <vector>
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#include <range/v3/core.hpp>
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#include <range/v3/view/chunk.hpp>
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#include <range/v3/view/drop_exactly.hpp>
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#include <range/v3/view/iota.hpp>
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#include <range/v3/view/join.hpp>
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#include <range/v3/view/reverse.hpp>
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#include <range/v3/view/take.hpp>
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#include <range/v3/view/transform.hpp>
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#include <range/v3/utility/copy.hpp>
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#include "../simple_test.hpp"
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#include "../test_utils.hpp"
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int main()
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{
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using namespace ranges;
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int rgi[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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auto rng0 = rgi | views::drop_exactly(6);
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has_type<int &>(*begin(rng0));
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CPP_assert(view_<decltype(rng0)>);
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CPP_assert(common_range<decltype(rng0)>);
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CPP_assert(sized_range<decltype(rng0)>);
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CPP_assert(random_access_iterator<decltype(begin(rng0))>);
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::check_equal(rng0, {6, 7, 8, 9, 10});
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CHECK(size(rng0) == 5u);
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auto rng1 = rng0 | views::reverse;
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has_type<int &>(*begin(rng1));
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CPP_assert(view_<decltype(rng1)>);
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CPP_assert(common_range<decltype(rng1)>);
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CPP_assert(sized_range<decltype(rng1)>);
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CPP_assert(random_access_iterator<decltype(begin(rng1))>);
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::check_equal(rng1, {10, 9, 8, 7, 6});
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std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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auto rng2 = v | views::drop_exactly(6) | views::reverse;
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has_type<int &>(*begin(rng2));
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CPP_assert(view_<decltype(rng2)>);
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CPP_assert(common_range<decltype(rng2)>);
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CPP_assert(sized_range<decltype(rng2)>);
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CPP_assert(random_access_iterator<decltype(begin(rng2))>);
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::check_equal(rng2, {10, 9, 8, 7, 6});
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std::list<int> l{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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auto rng3 = l | views::drop_exactly(6);
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has_type<int &>(*begin(rng3));
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CPP_assert(view_<decltype(rng3)>);
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CPP_assert(common_range<decltype(rng3)>);
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CPP_assert(sized_range<decltype(rng3)>);
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CPP_assert(bidirectional_iterator<decltype(begin(rng3))>);
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CPP_assert(!random_access_iterator<decltype(begin(rng3))>);
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::check_equal(rng3, {6, 7, 8, 9, 10});
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auto rng4 = views::iota(10) | views::drop_exactly(10);
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CPP_assert(view_<decltype(rng4)>);
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CPP_assert(!common_range<decltype(rng4)>);
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CPP_assert(!sized_range<decltype(rng4)>);
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static_assert(ranges::is_infinite<decltype(rng4)>::value, "");
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auto b = ranges::begin(rng4);
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CHECK(*b == 20);
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CHECK(*(b+1) == 21);
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auto rng5 = views::iota(10) | views::drop_exactly(10) | views::take(10) | views::reverse;
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CPP_assert(view_<decltype(rng5)>);
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CPP_assert(common_range<decltype(rng5)>);
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CPP_assert(sized_range<decltype(rng5)>);
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static_assert(!ranges::is_infinite<decltype(rng5)>::value, "");
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::check_equal(rng5, {29, 28, 27, 26, 25, 24, 23, 22, 21, 20});
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CHECK(size(rng5) == 10u);
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{
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// drop_exactly should work with random-access mutable-only Views.
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auto odds = views::iota(0) |
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views::chunk(2) |
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views::transform(views::drop_exactly(1)) |
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views::join;
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(void)odds;
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}
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{
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auto rng = debug_input_view<int const>{rgi} | views::drop_exactly(5);
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using Rng = decltype(rng);
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CPP_assert(input_range<Rng> && view_<Rng>);
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CPP_assert(sized_range<Rng>);
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::check_equal(rng, {5,6,7,8,9,10});
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}
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return test_result();
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}
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