mirror of
https://github.com/boostorg/optional.git
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84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
// Copyright (C) 2014 Andrzej Krzemienski.
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// Copyright (C) 2024 Alexander Grund
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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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#ifdef BOOST_BORLANDC
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#pragma hdrstop
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#endif
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#include "boost/core/lightweight_test.hpp"
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#include "boost/none.hpp"
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struct SemiRegular // no operator==
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{
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private: void operator==(SemiRegular const&) const {}
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private: void operator!=(SemiRegular const&) const {}
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};
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void test_equal_to_none_of_noncomparable_T()
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{
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boost::optional<SemiRegular> i = SemiRegular();
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boost::optional<SemiRegular> o;
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BOOST_TEST(i != boost::none);
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BOOST_TEST(boost::none != i);
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BOOST_TEST(o == boost::none);
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BOOST_TEST(boost::none == o);
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}
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void test_comparison_to_none()
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{
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using boost::none;
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boost::optional<SemiRegular> i = SemiRegular();
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// the default ordering of optional<size_t> is{ boost::none, 0, 1, 2, ... }
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// Hence boost::none < i for any engaged i
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// and all others operators ( ==, !=, <, <=, >, >= ) follow
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BOOST_TEST(!(i == none));
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BOOST_TEST(i != none);
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BOOST_TEST(!(i < none));
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BOOST_TEST(!(i <= none));
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BOOST_TEST(i > none);
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BOOST_TEST(i >= none);
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// Comparison is symmetric
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BOOST_TEST(!(none == i));
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BOOST_TEST(none != i);
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BOOST_TEST(none < i);
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BOOST_TEST(none <= i);
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BOOST_TEST(!(none > i));
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BOOST_TEST(!(none >= i));
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// An un-engaged optional is always equal to none
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boost::optional<SemiRegular> o;
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BOOST_TEST(o == none);
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BOOST_TEST(!(o != none));
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BOOST_TEST(!(o < none));
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BOOST_TEST(o <= none);
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BOOST_TEST(!(o > none));
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BOOST_TEST(o >= none);
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// Comparison is symmetric
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BOOST_TEST(none == o);
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BOOST_TEST(!(none != o));
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BOOST_TEST(!(none < o));
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BOOST_TEST(none <= o);
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BOOST_TEST(!(none > o));
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BOOST_TEST(none >= o);
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}
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int main()
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{
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test_equal_to_none_of_noncomparable_T();
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return boost::report_errors();
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}
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