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Telegram/ThirdParty/range-v3/test/view/const.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 <iterator>
+#include <functional>
+#include <range/v3/core.hpp>
+#include <range/v3/view/const.hpp>
+#include <range/v3/view/counted.hpp>
+#include <range/v3/view/zip.hpp>
+#include <range/v3/view/move.hpp>
+#include <range/v3/utility/copy.hpp>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+#include "../test_iterators.hpp"
+
+int main()
+{
+    using namespace ranges;
+
+    int rgi[] = {1, 2, 3, 4};
+
+    {
+        auto rng = rgi | views::const_;
+        has_type<int &>(*begin(rgi));
+        has_type<int const &>(*begin(rng));
+        CPP_assert(same_as<range_rvalue_reference_t<decltype(rng)>, int const &&>);
+        CPP_assert(view_<decltype(rng)>);
+        CPP_assert(common_range<decltype(rng)>);
+        CPP_assert(sized_range<decltype(rng)>);
+        CPP_assert(random_access_range<decltype(rng)>);
+        ::check_equal(rng, {1, 2, 3, 4});
+        CHECK(&*begin(rng) == &rgi[0]);
+        CHECK(rng.size() == 4u);
+    }
+
+    {
+        auto rng2 = views::counted(ForwardIterator<int*>(rgi), 4) | views::const_;
+        has_type<int const &>(*begin(rng2));
+        CPP_assert(same_as<range_rvalue_reference_t<decltype(rng2)>, int const &&>);
+        CPP_assert(view_<decltype(rng2)>);
+        CPP_assert(forward_range<decltype(rng2)>);
+        CPP_assert(!bidirectional_range<decltype(rng2)>);
+        CPP_assert(!common_range<decltype(rng2)>);
+        CPP_assert(sized_range<decltype(rng2)>);
+        ::check_equal(rng2, {1, 2, 3, 4});
+        CHECK(&*begin(rng2) == &rgi[0]);
+        CHECK(rng2.size() == 4u);
+    }
+
+    {
+        auto zip = views::zip(rgi, rgi);
+        auto rng3 = zip | views::const_;
+        has_type<common_pair<int &, int &>>(*begin(zip));
+        has_type<common_pair<int &&, int &&>>(iter_move(begin(zip)));
+        has_type<common_pair<int const &, int const &>>(*begin(rng3));
+        has_type<common_pair<int const &&, int const &&>>(iter_move(begin(rng3)));
+        CPP_assert(view_<decltype(rng3)>);
+        CPP_assert(random_access_range<decltype(rng3)>);
+        CPP_assert(common_range<decltype(rng3)>);
+        CPP_assert(sized_range<decltype(rng3)>);
+        using P = std::pair<int,int>;
+        ::check_equal(rng3, {P{1,1}, P{2,2}, P{3,3}, P{4,4}});
+        CHECK(&(*begin(rng3)).first == &rgi[0]);
+        CHECK(rng3.size() == 4u);
+    }
+
+    {
+        auto zip2 = views::zip(rgi, rgi) | views::move;
+        auto rng4 = zip2 | views::const_;
+        has_type<common_pair<int &&, int &&>>(*begin(zip2));
+        has_type<common_pair<int &&, int &&>>(iter_move(begin(zip2)));
+        has_type<common_pair<int const &&, int const &&>>(*begin(rng4));
+        has_type<common_pair<int const &&, int const &&>>(iter_move(begin(rng4)));
+        CPP_assert(view_<decltype(rng4)>);
+        CPP_assert(random_access_range<decltype(rng4)>);
+        CPP_assert(common_range<decltype(rng4)>);
+        CPP_assert(sized_range<decltype(rng4)>);
+        using P = std::pair<int,int>;
+        ::check_equal(rng4, {P{1,1}, P{2,2}, P{3,3}, P{4,4}});
+        CHECK(&(*begin(rng4)).first == &rgi[0]);
+        CHECK(rng4.size() == 4u);
+    }
+
+    {
+        auto rng = debug_input_view<int>{rgi} | views::const_;
+        CPP_assert(same_as<int const&, range_reference_t<decltype(rng)>>);
+        ::check_equal(rng, rgi);
+    }
+
+    return test_result();
+}