mirror of
https://github.com/boostorg/optional.git
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71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
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// Copyright (C) 2026 Andrzej Krzemienski.
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//
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See 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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//
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// See http://www.boost.org/lib/optional for documentation.
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//
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// You are welcome to contact the author at:
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// akrzemi1@gmail.com
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#include "boost/optional/optional.hpp"
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#include "boost/core/lightweight_test.hpp"
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#include <type_traits>
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#ifndef BOOST_NO_CXX20_HDR_RANGES
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#include <ranges>
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#include <concepts>
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#include <iterator>
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#include <array>
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#include <string>
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static_assert(std::equality_comparable<boost::none_t>, "boost::none shall be equality comparable");
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template <typename T>
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void test_that_you_can_find_none_in_a_range_of_optional(T x, T y)
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{
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static_assert(std::equality_comparable_with<boost::optional<T>, boost::none_t>, "boost::none shall satisfy the concept");
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static_assert(std::equality_comparable_with<boost::none_t, boost::optional<T> >, "boost::none shall satisfy the concept");
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static_assert(std::indirect_binary_predicate<std::ranges::equal_to, const boost::optional<T>*, const boost::none_t*>, "boost::none shall satisfy the concept");
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// [0] [1] [2]
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std::array<boost::optional<T>, 3> arr = {{ x, boost::none, y }};
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auto it = std::ranges::find(arr, boost::none);
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BOOST_TEST_EQ(std::distance(arr.begin(), it), 1);
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}
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#endif // BOOST_NO_CXX20_HDR_RANGES
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# if (defined __GNUC__) && (!defined BOOST_INTEL_CXX_VERSION) && (!defined __clang__)
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# if (__GNUC__ <= 4)
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# define BOOST_OPTIONAL_TEST_INSUFFICIENT_TYPE_TRAIT_SUPPORT
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# endif
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# endif
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#ifndef BOOST_OPTIONAL_TEST_INSUFFICIENT_TYPE_TRAIT_SUPPORT
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static_assert(std::is_trivially_copyable<boost::none_t>::value, "boost::none shall be trivially copyable");
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#endif
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void test_that_none_is_equal_to_none()
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{
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BOOST_TEST(boost::none == boost::none);
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BOOST_TEST(!(boost::none != boost::none));
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auto None = boost::none;
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BOOST_TEST(None == boost::none);
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BOOST_TEST(!(None != boost::none));
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}
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int main()
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{
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#ifndef BOOST_NO_CXX20_HDR_RANGES
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test_that_you_can_find_none_in_a_range_of_optional(1, 2);
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test_that_you_can_find_none_in_a_range_of_optional<std::string>("one", "two");
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#endif
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test_that_none_is_equal_to_none();
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return boost::report_errors();
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}
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