| 1 | // Copyright 2021 Peter Dimov. |
|---|---|
| 2 | // Distributed under the Boost Software License, Version 1.0. |
| 3 | // https://www.boost.org/LICENSE_1_0.txt |
| 4 | |
| 5 | #include <boost/system/result.hpp> |
| 6 | #include <boost/core/lightweight_test.hpp> |
| 7 | #include <string> |
| 8 | |
| 9 | using namespace boost::system; |
| 10 | |
| 11 | struct X |
| 12 | { |
| 13 | int a, b; |
| 14 | }; |
| 15 | |
| 16 | result<X> fx1() |
| 17 | { |
| 18 | return {{ EINVAL, generic_category() }}; |
| 19 | } |
| 20 | |
| 21 | struct Y |
| 22 | { |
| 23 | std::string v; |
| 24 | }; |
| 25 | |
| 26 | struct E |
| 27 | { |
| 28 | int v; |
| 29 | }; |
| 30 | |
| 31 | result<Y, E> fy1() |
| 32 | { |
| 33 | return {{ .v: 42 }}; |
| 34 | } |
| 35 | |
| 36 | int main() |
| 37 | { |
| 38 | { |
| 39 | result<X> r = fx1(); |
| 40 | |
| 41 | BOOST_TEST( !r.has_value() ); |
| 42 | BOOST_TEST( r.has_error() ); |
| 43 | |
| 44 | BOOST_TEST_EQ( r.error(), error_code( EINVAL, generic_category() ) ); |
| 45 | } |
| 46 | |
| 47 | { |
| 48 | result<Y, E> r = fy1(); |
| 49 | |
| 50 | BOOST_TEST( !r.has_value() ); |
| 51 | BOOST_TEST( r.has_error() ); |
| 52 | |
| 53 | BOOST_TEST_EQ( r.error().v, 42 ); |
| 54 | } |
| 55 | |
| 56 | return boost::report_errors(); |
| 57 | } |
| 58 |