tg_windows5.12.6/Telegram/ThirdParty/range-v3/test/view/indirect.cpp

// 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();
}