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Telegram/ThirdParty/range-v3/test/view/facade.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 <vector>
+#include <range/v3/core.hpp>
+#include <range/v3/utility/copy.hpp>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+
+struct MyRange
+  : ranges::view_facade<MyRange>
+{
+private:
+    friend ranges::range_access;
+    std::vector<int> ints_;
+    struct cursor
+    {
+    private:
+        std::vector<int>::const_iterator iter;
+    public:
+        using contiguous = std::true_type;
+        cursor() = default;
+        cursor(std::vector<int>::const_iterator it)
+          : iter(it)
+        {}
+        int const & read() const
+        {
+            return *iter;
+        }
+        bool equal(cursor const &that) const
+        {
+            return iter == that.iter;
+        }
+        void next()
+        {
+            ++iter;
+        }
+        void prev()
+        {
+            --iter;
+        }
+        std::ptrdiff_t distance_to(cursor const &that) const
+        {
+            return that.iter - iter;
+        }
+        void advance(std::ptrdiff_t n)
+        {
+            iter += n;
+        }
+    };
+    cursor begin_cursor() const
+    {
+        return {ints_.begin()};
+    }
+    cursor end_cursor() const
+    {
+        return {ints_.end()};
+    }
+public:
+    MyRange()
+      : ints_{1, 2, 3, 4, 5, 6, 7}
+    {}
+};
+
+int main()
+{
+    using namespace ranges;
+    {
+        auto r = MyRange{};
+        CPP_assert(view_<decltype(r)>);
+        CPP_assert(common_range<decltype(r)>);
+        CPP_assert(sized_range<decltype(r)>);
+        CPP_assert(contiguous_range<decltype(r)>);
+        ::check_equal(r, {1, 2, 3, 4, 5, 6, 7});
+
+        CHECK(7u == r.size());
+        CHECK(1 == r.front());
+        CHECK(7 == r.back());
+        CHECK(&*r.begin() == r.data());
+        CHECK(r[1] == 2);
+        CHECK(r[5] == 6);
+    }
+
+    {
+        const auto r = MyRange{};
+        CPP_assert(common_range<decltype(r)>);
+        CPP_assert(sized_range<decltype(r)>);
+        CPP_assert(random_access_range<decltype(r)>);
+        CPP_assert(contiguous_range<decltype(r)>);
+        ::check_equal(r, {1, 2, 3, 4, 5, 6, 7});
+
+        CHECK(7u == r.size());
+        CHECK(1 == r.front());
+        CHECK(7 == r.back());
+        CHECK(&*r.begin() == r.data());
+        CHECK(r[1] == 2);
+        CHECK(r[5] == 6);
+    }
+
+    return test_result();
+}