--- /dev/null
+// Copyright 2017, 2021, 2022 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/system/result.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <system_error>
+
+using namespace boost::system;
+
+struct X
+{
+ int v_;
+
+ explicit X( int v ): v_( v ) {}
+
+ X( X const& ) = delete;
+ X& operator=( X const& ) = delete;
+};
+
+struct Y
+{
+};
+
+struct E
+{
+};
+
+BOOST_NORETURN void throw_exception_from_error( Y const &, boost::source_location const& )
+{
+ throw E();
+}
+
+struct E2
+{
+};
+
+int main()
+{
+ {
+ result<int> r;
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_EQ( r.value(), 0 );
+ BOOST_TEST_EQ( *r, 0 );
+
+ BOOST_TEST_EQ( r.operator->(), &*r );
+ }
+
+ {
+ result<int> const r;
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_EQ( r.value(), 0 );
+ BOOST_TEST_EQ( *r, 0 );
+
+ BOOST_TEST_EQ( r.operator->(), &*r );
+ }
+
+ {
+ BOOST_TEST( result<int>().has_value() );
+ BOOST_TEST( !result<int>().has_error() );
+
+ BOOST_TEST( result<int>() );
+ BOOST_TEST_NOT( !result<int>() );
+
+ BOOST_TEST_EQ( result<int>().value(), 0 );
+ BOOST_TEST_EQ( *result<int>(), 0 );
+
+ BOOST_TEST( result<int>().operator->() != 0 );
+ }
+
+ {
+ result<int> r( 1 );
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_EQ( r.value(), 1 );
+ BOOST_TEST_EQ( *r, 1 );
+
+ BOOST_TEST_EQ( r.operator->(), &*r );
+ }
+
+ {
+ result<int> const r( 1 );
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_EQ( r.value(), 1 );
+ BOOST_TEST_EQ( *r, 1 );
+
+ BOOST_TEST_EQ( r.operator->(), &*r );
+ }
+
+ {
+ BOOST_TEST( result<int>( 1 ).has_value() );
+ BOOST_TEST( !result<int>( 1 ).has_error() );
+
+ BOOST_TEST( result<int>( 1 ) );
+ BOOST_TEST_NOT( !result<int>( 1 ) );
+
+ BOOST_TEST_EQ( result<int>( 1 ).value(), 1 );
+ BOOST_TEST_EQ( *result<int>( 1 ), 1 );
+
+ BOOST_TEST( result<int>( 1 ).operator->() != 0 );
+ }
+
+ {
+ auto ec = make_error_code( errc::invalid_argument );
+
+ result<int> r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ auto ec = make_error_code( errc::invalid_argument );
+
+ result<int> const r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ auto ec = make_error_code( errc::invalid_argument );
+
+ BOOST_TEST( !result<int>( ec ).has_value() );
+ BOOST_TEST( result<int>( ec ).has_error() );
+
+ BOOST_TEST_NOT( result<int>( ec ) );
+ BOOST_TEST( !result<int>( ec ) );
+
+ BOOST_TEST_THROWS( result<int>( ec ).value(), system_error );
+
+ BOOST_TEST_EQ( result<int>( ec ).operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ auto ec = make_error_code( std::errc::invalid_argument );
+
+ result<int, std::error_code> const r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), std::system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ result<int, errc::errc_t> const r( in_place_error, errc::invalid_argument );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ result<int, std::errc> const r( std::errc::invalid_argument );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), std::system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ result<int, std::exception_ptr> const r( std::make_exception_ptr( E2() ) );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), E2 );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ result<int, std::exception_ptr> const r( in_place_error );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), std::bad_exception );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+ }
+
+ {
+ result<X> r( 1 );
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_EQ( r.value().v_, 1 );
+ BOOST_TEST_EQ( (*r).v_, 1 );
+ BOOST_TEST_EQ( r->v_, 1 );
+
+ BOOST_TEST_EQ( r.operator->(), &*r );
+ }
+
+ {
+ result<X> const r( 1 );
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_EQ( r.value().v_, 1 );
+ BOOST_TEST_EQ( (*r).v_, 1 );
+ BOOST_TEST_EQ( r->v_, 1 );
+
+ BOOST_TEST_EQ( r.operator->(), &*r );
+ }
+
+ {
+ BOOST_TEST( result<X>( 1 ).has_value() );
+ BOOST_TEST( !result<X>( 1 ).has_error() );
+
+ BOOST_TEST( result<X>( 1 ) );
+ BOOST_TEST_NOT( !result<X>( 1 ) );
+
+ BOOST_TEST_EQ( result<X>( 1 ).value().v_, 1 );
+ BOOST_TEST_EQ( (*result<X>( 1 )).v_, 1 );
+ BOOST_TEST_EQ( result<X>( 1 )->v_, 1 );
+ }
+
+ {
+ auto ec = Y();
+
+ result<X, Y> r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), E );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<X*>(0) );
+ }
+
+ {
+ auto ec = Y();
+
+ result<X, Y> const r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), E );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<X*>(0) );
+ }
+
+ {
+ auto ec = Y();
+
+ BOOST_TEST(( !result<X, Y>( ec ).has_value() ));
+ BOOST_TEST(( result<X, Y>( ec ).has_error() ));
+
+ BOOST_TEST_NOT(( result<X, Y>( ec ) ));
+ BOOST_TEST(( !result<X, Y>( ec ) ));
+
+ BOOST_TEST_THROWS( (result<X, Y>( ec ).value()), E );
+
+ BOOST_TEST_EQ( (result<X, Y>( ec ).operator->()), static_cast<X*>(0) );
+ }
+
+ {
+ result<void> r;
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_NO_THROW( r.value() );
+
+ BOOST_TEST( r.operator->() != 0 );
+ }
+
+ {
+ result<void> const r;
+
+ BOOST_TEST( r.has_value() );
+ BOOST_TEST( !r.has_error() );
+
+ BOOST_TEST( r );
+ BOOST_TEST_NOT( !r );
+
+ BOOST_TEST_NO_THROW( r.value() );
+
+ BOOST_TEST( r.operator->() != 0 );
+ }
+
+ {
+ BOOST_TEST( result<void>().has_value() );
+ BOOST_TEST( !result<void>().has_error() );
+
+ BOOST_TEST( result<void>() );
+ BOOST_TEST_NOT( !result<void>() );
+
+ BOOST_TEST_NO_THROW( result<void>().value() );
+
+ BOOST_TEST( result<void>().operator->() != 0 );
+ }
+
+ {
+ auto ec = make_error_code( errc::invalid_argument );
+
+ result<void> r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<void*>(0) );
+ }
+
+ {
+ auto ec = make_error_code( errc::invalid_argument );
+
+ result<void> const r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<void*>(0) );
+ }
+
+ {
+ auto ec = make_error_code( errc::invalid_argument );
+
+ BOOST_TEST( !result<void>( ec ).has_value() );
+ BOOST_TEST( result<void>( ec ).has_error() );
+
+ BOOST_TEST_NOT( result<void>( ec ) );
+ BOOST_TEST( !result<void>( ec ) );
+
+ BOOST_TEST_THROWS( result<void>( ec ).value(), system_error );
+
+ BOOST_TEST_EQ( result<void>( ec ).operator->(), static_cast<void*>(0) );
+ }
+
+ {
+ auto ec = make_error_code( std::errc::invalid_argument );
+
+ result<void, std::error_code> const r( ec );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), std::system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<void*>(0) );
+ }
+
+ {
+ result<void, errc::errc_t> const r( in_place_error, errc::invalid_argument );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<void*>(0) );
+ }
+
+ {
+ result<void, std::errc> const r( std::errc::invalid_argument );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), std::system_error );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<void*>(0) );
+ }
+
+ {
+ result<void, std::exception_ptr> const r( std::make_exception_ptr( E2() ) );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), E2 );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<void*>(0) );
+ }
+
+ {
+ result<void, std::exception_ptr> const r( in_place_error );
+
+ BOOST_TEST( !r.has_value() );
+ BOOST_TEST( r.has_error() );
+
+ BOOST_TEST_NOT( r );
+ BOOST_TEST( !r );
+
+ BOOST_TEST_THROWS( r.value(), std::bad_exception );
+
+ BOOST_TEST_EQ( r.operator->(), static_cast<void*>(0) );
+ }
+
+ return boost::report_errors();
+}