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100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
// Range v3 library
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//
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// Copyright Eric Niebler 2014-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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#include <utility> // for std::swap on C++14.
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#include <map>
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#include <set>
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#include <list>
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#include <sstream>
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#include <string>
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#include <vector>
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#include <range/v3/core.hpp>
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#include <range/v3/view/any_view.hpp>
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#include <range/v3/view/concat.hpp>
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#include <range/v3/view/drop.hpp>
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#include <range/v3/view/take.hpp>
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#include <range/v3/view/repeat.hpp>
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#include <range/v3/view/reverse.hpp>
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#include <range/v3/view/transform.hpp>
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#include <range/v3/view/for_each.hpp>
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#include <range/v3/view/iota.hpp>
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#include <range/v3/view/zip.hpp>
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#include "../simple_test.hpp"
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#include "../test_utils.hpp"
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int main()
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{
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using namespace ranges;
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// 1-d vector
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auto v = views::ints | views::take(10) | to<std::vector>();
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::check_equal(v, {0,1,2,3,4,5,6,7,8,9});
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v = views::iota(10) | views::take(10) | views::reverse | to<std::vector>();
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::check_equal(v, {19,18,17,16,15,14,13,12,11,10});
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// 1-d list
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auto l = views::ints | views::take(10) | to<std::list>();
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::check_equal(l, {0,1,2,3,4,5,6,7,8,9});
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l = views::iota(10) | views::take(10) | views::reverse | to<std::list>();
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::check_equal(l, {19,18,17,16,15,14,13,12,11,10});
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// 2-d vector
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auto vv = views::repeat_n(views::ints(0, 8), 10) | to<std::vector<std::vector<int>>>();
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::check_equal(vv, std::vector<std::vector<int>>(10, {0,1,2,3,4,5,6,7}));
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// issue #556
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{
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std::string s{"abc"};
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any_view<any_view<char, category::random_access>, category::random_access> v1 =
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views::single(s | views::drop(1));
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any_view<any_view<char, category::random_access>, category::random_access> v2 =
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views::single(s | views::drop(2));
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auto v3 = views::concat(v1, v2);
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auto owner1 = v3 | to<std::vector<std::vector<char>>>();
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auto owner2 = v3 | to<std::vector<std::string>>();
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::check_equal(owner1, std::vector<std::vector<char>>{{'b', 'c'}, {'c'}});
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::check_equal(owner2, std::vector<std::string>{{"bc"}, {"c"}});
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}
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// map
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auto to_string = [](int i){ std::stringstream str; str << i; return str.str(); };
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auto m = views::zip(views::ints, views::ints | views::transform(to_string)) |
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views::take(5) | to<std::map<int, std::string>>();
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using P = std::pair<int const, std::string>;
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::check_equal(m, {P{0,"0"}, P{1,"1"}, P{2,"2"}, P{3,"3"}, P{4,"4"}});
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// Another way to say the same thing, but with a range comprehension:
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m = views::for_each(views::ints(0,5), [&](int i) {
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return yield(std::make_pair(i, to_string(i)));
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}) | to<std::map<int, std::string>>();
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::check_equal(m, {P{0,"0"}, P{1,"1"}, P{2,"2"}, P{3,"3"}, P{4,"4"}});
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// set
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CPP_assert(range<std::set<int>>);
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CPP_assert(!view_<std::set<int>>);
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auto s = views::ints | views::take(10) | to<std::set<int>>();
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::check_equal(s, {0,1,2,3,4,5,6,7,8,9});
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static_assert(!view_<std::initializer_list<int>>, "");
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return ::test_result();
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}
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