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Telegram/ThirdParty/range-v3/test/view/indirect.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 <memory>
+#include <range/v3/core.hpp>
+#include <range/v3/view/indirect.hpp>
+#include <range/v3/view/transform.hpp>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+
+int main()
+{
+    using namespace ranges;
+
+    {
+        std::vector<std::shared_ptr<int>> vp;
+        for(int i = 0; i < 10; ++i)
+            vp.push_back(std::make_shared<int>(i));
+        auto && rng = vp | views::indirect;
+        CHECK(&*begin(rng) == vp[0].get());
+        ::check_equal(rng, {0, 1, 2, 3, 4, 5, 6, 7, 8, 9});
+    }
+
+    {
+        int const some_ints[] = {0,1,2,3};
+        int const *some_int_pointers[] = {
+            some_ints + 0, some_ints + 1, some_ints + 2, some_ints + 3
+        };
+        auto make_range = [&]{
+            return debug_input_view<int const *>{some_int_pointers} | views::indirect;
+        };
+        auto rng = make_range();
+        ::check_equal(rng, some_ints);
+        rng = make_range();
+        CHECK(&*begin(rng) == some_ints + 0);
+    }
+
+#if RANGES_CXX_RETURN_TYPE_DEDUCTION >= RANGES_CXX_RETURN_TYPE_DEDUCTION_14
+    {
+        // regression test for #946
+        class Data;
+
+        struct Test
+        {
+            std::vector<Data*> m_list;
+
+            auto list()
+            {
+                return m_list | ranges::views::indirect;
+            }
+        };
+
+        class Data
+        {};
+
+        CHECK(Test{std::vector<Data*>(42)}.list().size() == 42u);
+    }
+#endif // RANGES_CXX_RETURN_TYPE_DEDUCTION
+
+    {
+        // regression test for #952
+        int some_ints[42]{};
+        auto a = some_ints | views::transform([](int& i) { return &i; })
+                           | views::indirect;
+        (void) a.begin();
+    }
+
+    return test_result();
+}