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21e03e7013
appropriate to do so. Appropriateness follows the algorithm for zip_view's iterator. See https://eel.is/c++draft/range.zip.transform.iterator#1. Requested by LEWG reviewers of iterator_interface.
164 lines
5.3 KiB
C++
164 lines
5.3 KiB
C++
// Copyright (C) 2019 T. Zachary Laine
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include "ill_formed.hpp"
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#include <boost/stl_interfaces/iterator_interface.hpp>
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#include <boost/stl_interfaces/view_interface.hpp>
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#include <boost/stl_interfaces/sequence_container_interface.hpp>
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#include <boost/core/lightweight_test.hpp>
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#include <array>
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#include <list>
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#include <vector>
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namespace detail = boost::stl_interfaces::detail;
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namespace v1_dtl = boost::stl_interfaces::v1::v1_dtl;
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#if BOOST_STL_INTERFACES_USE_CONCEPTS
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namespace v2_dtl = boost::stl_interfaces::v2::v2_dtl;
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#endif
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// iter_difference_t
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static_assert(
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std::is_same<v1_dtl::iter_difference_t<int *>, std::ptrdiff_t>::value, "");
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static_assert(std::is_same<
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v1_dtl::iter_difference_t<std::vector<double>::iterator>,
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std::vector<double>::difference_type>::value, "");
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static_assert(std::is_same<
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v1_dtl::iter_difference_t<std::list<double>::iterator>,
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std::list<double>::difference_type>::value, "");
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struct ridiculous_range
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{
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int * begin() { return nullptr; }
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double end() { return 1.3; }
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};
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// iterator_t
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static_assert(std::is_same<
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v1_dtl::iterator_t<std::vector<double>>,
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std::vector<double>::iterator>::value, "");
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static_assert(std::is_same<
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v1_dtl::iterator_t<std::list<double>>,
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std::list<double>::iterator>::value, "");
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static_assert(std::is_same<v1_dtl::iterator_t<ridiculous_range>, int *>::value, "");
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// sentinel_t
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static_assert(std::is_same<
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v1_dtl::sentinel_t<std::vector<double>>,
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std::vector<double>::iterator>::value, "");
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static_assert(std::is_same<
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v1_dtl::sentinel_t<std::list<double>>,
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std::list<double>::iterator>::value, "");
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static_assert(std::is_same<v1_dtl::sentinel_t<ridiculous_range>, double>::value, "");
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// range_difference_t
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static_assert(
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std::is_same<
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v1_dtl::range_difference_t<std::vector<double>>,
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std::iterator_traits<std::vector<double>::iterator>::difference_type>::value, "");
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static_assert(
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std::is_same<
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v1_dtl::range_difference_t<std::list<double>>,
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std::iterator_traits<std::list<double>::iterator>::difference_type>::value, "");
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static_assert(std::is_same<
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v1_dtl::range_difference_t<ridiculous_range>,
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std::ptrdiff_t>::value, "");
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// common_range
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static_assert(v1_dtl::common_range<std::vector<double>>::value, "");
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static_assert(v1_dtl::common_range<std::list<double>>::value, "");
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static_assert(!v1_dtl::common_range<ridiculous_range>::value, "");
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// iterator_category_base
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template<typename T>
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using nested_iterator_category = typename T::iterator_category;
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#if BOOST_STL_INTERFACES_USE_CONCEPTS
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static_assert(
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ill_formed<
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nested_iterator_category,
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v2_dtl::iterator_category_base<std::input_iterator_tag, int &>>{});
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static_assert(ill_formed<
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nested_iterator_category,
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v2_dtl::iterator_category_base<std::input_iterator_tag, int>>{});
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static_assert(
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ill_formed<
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nested_iterator_category,
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v2_dtl::iterator_category_base<std::output_iterator_tag, int &>>{});
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static_assert(ill_formed<
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nested_iterator_category,
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v2_dtl::iterator_category_base<std::output_iterator_tag, int>>{});
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static_assert(std::is_same<
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nested_iterator_category<v2_dtl::iterator_category_base<
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std::random_access_iterator_tag,
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int &>>,
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std::random_access_iterator_tag>::value);
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static_assert(std::is_same<
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nested_iterator_category<v2_dtl::iterator_category_base<
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std::random_access_iterator_tag,
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int>>,
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std::input_iterator_tag>::value);
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static_assert(std::is_same<
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nested_iterator_category<v2_dtl::iterator_category_base<
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std::bidirectional_iterator_tag,
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int &>>,
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std::bidirectional_iterator_tag>::value);
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static_assert(std::is_same<
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nested_iterator_category<v2_dtl::iterator_category_base<
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std::bidirectional_iterator_tag,
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int>>,
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std::input_iterator_tag>::value);
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static_assert(
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std::is_same<
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nested_iterator_category<
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v2_dtl::iterator_category_base<std::forward_iterator_tag, int &>>,
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std::forward_iterator_tag>::value);
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static_assert(
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std::is_same<
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nested_iterator_category<
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v2_dtl::iterator_category_base<std::forward_iterator_tag, int>>,
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std::input_iterator_tag>::value);
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#endif
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struct no_clear
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{};
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int main()
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{
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{
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{
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no_clear nc;
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v1_dtl::clear_impl<no_clear>::call(nc);
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}
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{
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std::vector<int> vec(10);
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v1_dtl::clear_impl<std::vector<int>>::call(vec);
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BOOST_TEST(vec.empty());
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}
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}
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{
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std::array<int, 5> ints = {{0, 1, 2, 3, 4}};
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int const new_value = 6;
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detail::n_iter<int, int> first = detail::make_n_iter(new_value, 3);
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detail::n_iter<int, int> last = detail::make_n_iter_end(new_value, 3);
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std::copy(first, last, &ints[1]);
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BOOST_TEST(ints == (std::array<int, 5>{{0, 6, 6, 6, 4}}));
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}
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return boost::report_errors();
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}
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