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// Range v3 library
//
// Copyright Eric Niebler 2014-present
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
#include <list>
#include <vector>
#include <range/v3/core.hpp>
#include <range/v3/view/chunk.hpp>
#include <range/v3/view/drop_exactly.hpp>
#include <range/v3/view/iota.hpp>
#include <range/v3/view/join.hpp>
#include <range/v3/view/reverse.hpp>
#include <range/v3/view/take.hpp>
#include <range/v3/view/transform.hpp>
#include <range/v3/utility/copy.hpp>
#include "../simple_test.hpp"
#include "../test_utils.hpp"
int main()
{
using namespace ranges;
int rgi[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
auto rng0 = rgi | views::drop_exactly(6);
has_type<int &>(*begin(rng0));
CPP_assert(view_<decltype(rng0)>);
CPP_assert(common_range<decltype(rng0)>);
CPP_assert(sized_range<decltype(rng0)>);
CPP_assert(random_access_iterator<decltype(begin(rng0))>);
::check_equal(rng0, {6, 7, 8, 9, 10});
CHECK(size(rng0) == 5u);
auto rng1 = rng0 | views::reverse;
has_type<int &>(*begin(rng1));
CPP_assert(view_<decltype(rng1)>);
CPP_assert(common_range<decltype(rng1)>);
CPP_assert(sized_range<decltype(rng1)>);
CPP_assert(random_access_iterator<decltype(begin(rng1))>);
::check_equal(rng1, {10, 9, 8, 7, 6});
std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
auto rng2 = v | views::drop_exactly(6) | views::reverse;
has_type<int &>(*begin(rng2));
CPP_assert(view_<decltype(rng2)>);
CPP_assert(common_range<decltype(rng2)>);
CPP_assert(sized_range<decltype(rng2)>);
CPP_assert(random_access_iterator<decltype(begin(rng2))>);
::check_equal(rng2, {10, 9, 8, 7, 6});
std::list<int> l{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
auto rng3 = l | views::drop_exactly(6);
has_type<int &>(*begin(rng3));
CPP_assert(view_<decltype(rng3)>);
CPP_assert(common_range<decltype(rng3)>);
CPP_assert(sized_range<decltype(rng3)>);
CPP_assert(bidirectional_iterator<decltype(begin(rng3))>);
CPP_assert(!random_access_iterator<decltype(begin(rng3))>);
::check_equal(rng3, {6, 7, 8, 9, 10});
auto rng4 = views::iota(10) | views::drop_exactly(10);
CPP_assert(view_<decltype(rng4)>);
CPP_assert(!common_range<decltype(rng4)>);
CPP_assert(!sized_range<decltype(rng4)>);
static_assert(ranges::is_infinite<decltype(rng4)>::value, "");
auto b = ranges::begin(rng4);
CHECK(*b == 20);
CHECK(*(b+1) == 21);
auto rng5 = views::iota(10) | views::drop_exactly(10) | views::take(10) | views::reverse;
CPP_assert(view_<decltype(rng5)>);
CPP_assert(common_range<decltype(rng5)>);
CPP_assert(sized_range<decltype(rng5)>);
static_assert(!ranges::is_infinite<decltype(rng5)>::value, "");
::check_equal(rng5, {29, 28, 27, 26, 25, 24, 23, 22, 21, 20});
CHECK(size(rng5) == 10u);
{
// drop_exactly should work with random-access mutable-only Views.
auto odds = views::iota(0) |
views::chunk(2) |
views::transform(views::drop_exactly(1)) |
views::join;
(void)odds;
}
{
auto rng = debug_input_view<int const>{rgi} | views::drop_exactly(5);
using Rng = decltype(rng);
CPP_assert(input_range<Rng> && view_<Rng>);
CPP_assert(sized_range<Rng>);
::check_equal(rng, {5,6,7,8,9,10});
}
return test_result();
}
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