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57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
// Copyright (C) 2021 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 "boost/none.hpp"
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//#ifndef BOOST_OPTIONAL_NO_CONVERTING_COPY_CTOR
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using boost::optional;
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struct implicit_bool_conv
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{
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operator bool() const { return false; }
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};
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struct explicit_bool_conv
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{
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explicit operator bool() const BOOST_NOEXCEPT { return true; }
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};
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template <typename To, typename From>
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void test_convert_assign()
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{
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optional<To> oi;
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oi = From();
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BOOST_TEST(oi);
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}
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void test_no_bad_assignment()
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{
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#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
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// this means that type trait `boost::is_assignable` works.
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BOOST_STATIC_ASSERT((boost::is_assignable<optional<bool>&, bool>::value));
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BOOST_STATIC_ASSERT((boost::is_assignable<optional<bool>&, implicit_bool_conv>::value));
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BOOST_STATIC_ASSERT((! boost::is_assignable<optional<bool>&, explicit_bool_conv>::value));
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#endif
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}
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int main()
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{
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test_convert_assign<int, short>();
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test_convert_assign<bool, implicit_bool_conv>();
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test_no_bad_assignment();
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return boost::report_errors();
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}
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