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Telegram/ThirdParty/range-v3/test/view/partial_sum.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 <functional>
+#include <iterator>
+#include <range/v3/core.hpp>
+#include <range/v3/utility/copy.hpp>
+#include <range/v3/view/counted.hpp>
+#include <range/v3/view/partial_sum.hpp>
+#include <range/v3/view/reverse.hpp>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+
+int main()
+{
+    using namespace ranges;
+
+    int rgi[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+
+    {
+        auto rng = rgi | views::partial_sum;
+        has_type<int &>(*begin(rgi));
+        has_type<int>(*begin(rng));
+        CPP_assert(view_<decltype(rng)>);
+        CPP_assert(sized_range<decltype(rng)>);
+        CPP_assert(forward_range<decltype(rng)>);
+        CPP_assert(!bidirectional_range<decltype(rng)>);
+        ::check_equal(rng, {1, 3, 6, 10, 15, 21, 28, 36, 45, 55});
+
+        auto it = begin(rng);
+        CHECK(*it == 1);
+        auto it2 = next(it);
+        CHECK(*it == 1);
+        CHECK(*it2 == 3);
+        it2 = it;
+        CHECK(*it2 == 1);
+        ++it2;
+        CHECK(*it2 == 3);
+    }
+
+    {
+        // Test partial_sum with a mutable lambda
+        int cnt = 0;
+        auto mutable_rng = views::partial_sum(rgi, [cnt](int i, int j) mutable { return i + j + cnt++;});
+        ::check_equal(mutable_rng, {1, 3, 7, 13, 21, 31, 43, 57, 73, 91});
+        CHECK(cnt == 0);
+        CPP_assert(view_<decltype(mutable_rng)>);
+        CPP_assert(!view_<decltype(mutable_rng) const>);
+    }
+
+    {
+        auto rng = debug_input_view<int const>{rgi} | views::partial_sum;
+        ::check_equal(rng, {1, 3, 6, 10, 15, 21, 28, 36, 45, 55});
+    }
+
+    {
+        static int const some_ints[] = {0,1,2,3,4};
+        auto t1 = ranges::views::partial_sum(some_ints);
+        auto t2 = some_ints | ranges::views::partial_sum;
+        ::check_equal(t1, t2);
+    }
+
+    return test_result();
+}