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SYBER / XS-librangeV3-1.12.0 / range-v3-0.12.0 / test / view / conversion.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 <utility> // for std::swap on C++14.
#include <map>
#include <set>
#include <list>
#include <sstream>
#include <string>
#include <vector>
#include <range/v3/core.hpp>
#include <range/v3/view/any_view.hpp>
#include <range/v3/view/concat.hpp>
#include <range/v3/view/drop.hpp>
#include <range/v3/view/take.hpp>
#include <range/v3/view/repeat.hpp>
#include <range/v3/view/reverse.hpp>
#include <range/v3/view/transform.hpp>
#include <range/v3/view/for_each.hpp>
#include <range/v3/view/iota.hpp>
#include <range/v3/view/zip.hpp>
#include "../simple_test.hpp"
#include "../test_utils.hpp"
int main()
{
    using namespace ranges;
    // 1-d vector
    auto v = views::ints | views::take(10) | to<std::vector>();
    ::check_equal(v, {0,1,2,3,4,5,6,7,8,9});
    v = views::iota(10) | views::take(10) | views::reverse | to<std::vector>();
    ::check_equal(v, {19,18,17,16,15,14,13,12,11,10});
    // 1-d list
    auto l = views::ints | views::take(10) | to<std::list>();
    ::check_equal(l, {0,1,2,3,4,5,6,7,8,9});
    l = views::iota(10) | views::take(10) | views::reverse | to<std::list>();
    ::check_equal(l, {19,18,17,16,15,14,13,12,11,10});
    // 2-d vector
    auto vv = views::repeat_n(views::ints(0, 8), 10) | to<std::vector<std::vector<int>>>();
    ::check_equal(vv, std::vector<std::vector<int>>(10, {0,1,2,3,4,5,6,7}));
    // issue #556
    {
        std::string s{"abc"};
        any_view<any_view<char, category::random_access>, category::random_access> v1 =
            views::single(s | views::drop(1));
        any_view<any_view<char, category::random_access>, category::random_access> v2 =
            views::single(s | views::drop(2));
        auto v3 = views::concat(v1, v2);
        auto owner1 = v3 | to<std::vector<std::vector<char>>>();
        auto owner2 = v3 | to<std::vector<std::string>>();
        ::check_equal(owner1, std::vector<std::vector<char>>{{'b', 'c'}, {'c'}});
        ::check_equal(owner2, std::vector<std::string>{{"bc"}, {"c"}});
    }
    // map
    auto to_string = [](int i){ std::stringstream str; str << i; return str.str(); };
    auto m = views::zip(views::ints, views::ints | views::transform(to_string)) |
        views::take(5) | to<std::map<int, std::string>>();
    using P = std::pair<int const, std::string>;
    ::check_equal(m, {P{0,"0"}, P{1,"1"}, P{2,"2"}, P{3,"3"}, P{4,"4"}});
    // Another way to say the same thing, but with a range comprehension:
    m = views::for_each(views::ints(0,5), [&](int i) {
            return yield(std::make_pair(i, to_string(i)));
        }) | to<std::map<int, std::string>>();
    ::check_equal(m, {P{0,"0"}, P{1,"1"}, P{2,"2"}, P{3,"3"}, P{4,"4"}});
    // set
    CPP_assert(range<std::set<int>>);
    CPP_assert(!view_<std::set<int>>);
    auto s = views::ints | views::take(10) | to<std::set<int>>();
    ::check_equal(s, {0,1,2,3,4,5,6,7,8,9});
    static_assert(!view_<std::initializer_list<int>>, "");
    return ::test_result();
}