1// Copyright 2017, 2021-2024 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
8using namespace boost::system;
9
10struct X
11{
12 int v_;
13};
14
15struct Y
16{
17 int v_;
18
19 explicit Y( int v ): v_( v ) {}
20 Y( X x ): v_( x.v_) {}
21
22 Y( Y const& ) = delete;
23 Y& operator=( Y const& ) = delete;
24
25 Y( Y&& r ): v_( r.v_ )
26 {
27 r.v_ = 0;
28 }
29
30 Y& operator=( Y&& r )
31 {
32 if( &r != this )
33 {
34 v_ = r.v_;
35 r.v_ = 0;
36 }
37
38 return *this;
39 }
40};
41
42struct E
43{
44};
45
46int main()
47{
48 {
49 result<int> r( 1 );
50
51 r |= 2;
52
53 BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( *r, 1 );
54 }
55
56 {
57 result<int, E> r( in_place_error );
58
59 r |= 2;
60
61 BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( *r, 2 );
62 }
63
64 {
65 result<Y> r( in_place_value, 1 );
66
67 r |= X{.v_: 2};
68
69 BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( r->v_, 1 );
70 }
71
72 {
73 result<Y, E> r( in_place_error );
74
75 r |= X{.v_: 2};
76
77 BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( r->v_, 2 );
78 }
79
80 {
81 int x1 = 1;
82 int x2 = 2;
83
84 result<int&> r( x1 );
85
86 r |= x2;
87
88 BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( &*r, &x1 );
89 }
90
91 {
92 int x2 = 2;
93
94 result<int&, E> r( in_place_error );
95
96 r |= x2;
97
98 BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( &*r, &x2 );
99 }
100
101 return boost::report_errors();
102}
103

source code of boost/libs/system/test/result_or_eq_value.cpp