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Telegram/ThirdParty/range-v3/test/view/take_exactly.cpp

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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/iota.hpp>
+#include <range/v3/view/take_exactly.hpp>
+#include <range/v3/view/reverse.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::take_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, {0, 1, 2, 3, 4, 5});
+    CHECK(size(rng0) == 6u);
+
+    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, {5, 4, 3, 2, 1, 0});
+
+    std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+    auto rng2 = v | views::take_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, {5, 4, 3, 2, 1, 0});
+
+    std::list<int> l{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+    auto rng3 = l | views::take_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, {0, 1, 2, 3, 4, 5});
+
+    auto rng4 = views::iota(10) | views::take_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, "");
+    ::check_equal(rng4, {10, 11, 12, 13, 14, 15, 16, 17, 18, 19});
+    CHECK(size(rng4) == 10u);
+
+    auto rng5 = views::iota(10) | views::take_exactly(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, {19, 18, 17, 16, 15, 14, 13, 12, 11, 10});
+    CHECK(size(rng5) == 10u);
+
+    {
+        auto rng = debug_input_view<int const>{rgi} | views::take_exactly(6);
+        ::check_equal(rng, {0, 1, 2, 3, 4, 5});
+    }
+
+    return test_result();
+}