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// Copyright 2023 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#if defined(_MSC_VER) && _MSC_VER < 1910
# pragma warning( disable: 4800 ) // forcing value to bool 'true' or 'false'
#endif
#include <boost/system/result.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <utility>
#include <type_traits>
using namespace boost::system;
// Tricky mixed construction cases
// https://github.com/boostorg/system/issues/104
// https://brevzin.github.io//c++/2023/01/18/optional-construction/
template<class R1, class R2> void test()
{
{
R1 r1( make_error_code( errc::invalid_argument ) );
R2 r2( r1 );
BOOST_TEST( !r2.has_value() );
}
{
R1 r1( 0 );
R2 r2( r1 );
BOOST_TEST( r2.has_value() ) && BOOST_TEST_EQ( r2.value(), false );
}
{
R1 r1( 1 );
R2 r2( r1 );
BOOST_TEST( r2.has_value() ) && BOOST_TEST_EQ( r2.value(), true );
}
{
R1 r1( make_error_code( errc::invalid_argument ) );
R2 r2( std::move( r1 ) );
BOOST_TEST( !r2.has_value() );
}
{
R1 r1( 0 );
R2 r2( std::move( r1 ) );
BOOST_TEST( r2.has_value() ) && BOOST_TEST_EQ( r2.value(), false );
}
{
R1 r1( 1 );
R2 r2( std::move( r1 ) );
BOOST_TEST( r2.has_value() ) && BOOST_TEST_EQ( r2.value(), true );
}
}
struct X
{
};
int main()
{
test< result<int>, result<bool> >();
test< result<int> const, result<bool> >();
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool>, result<X>&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool>, result<X> const&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool>, result<X>&&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool>, result<X> const&&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool const>, result<X>&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool const>, result<X> const&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool const>, result<X>&&>));
BOOST_TEST_TRAIT_FALSE((std::is_constructible<result<bool const>, result<X> const&&>));
return boost::report_errors();
}
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