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

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+// Range v3 library
+//
+//  Copyright Eric Niebler 2017-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 <sstream>
+#include <range/v3/core.hpp>
+#include <range/v3/view/tail.hpp>
+#include <range/v3/view/empty.hpp>
+#include <range/v3/view/single.hpp>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+#include "../test_iterators.hpp"
+
+int main()
+{
+    using namespace ranges;
+
+    {
+        std::vector<int> v{0,1,2,3};
+        auto rng = views::tail(v);
+        check_equal(rng, {1,2,3});
+        CHECK(size(rng) == 3u);
+    }
+
+    {
+        std::vector<int> v{};
+        auto rng = views::tail(v);
+        CHECK(empty(rng));
+        CHECK(size(rng) == 0u);
+    }
+
+    {
+        std::stringstream sin{"1 2 3 4"};
+        istream_view<int> is(sin);
+        auto rng = views::tail(is);
+        check_equal(rng, {2,3,4});
+    }
+
+    {
+        std::stringstream sin{""};
+        istream_view<int> is(sin);
+        auto rng = views::tail(is);
+        CHECK(rng.begin() == rng.end());
+    }
+
+    {
+        auto rng = views::empty<int> | views::tail;
+        static_assert(0 == size(rng), "");
+        CPP_assert(same_as<empty_view<int>, decltype(rng)>);
+    }
+
+    {
+        tail_view<empty_view<int>> const rng(views::empty<int>);
+        static_assert(0 == size(rng), "");
+    }
+
+    {
+        auto const rng = views::single(1) | views::tail;
+        static_assert(0 == size(rng), "");
+    }
+
+    return ::test_result();
+}