1 //===- unittests/ErrorOrTest.cpp - ErrorOr.h tests ------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/Support/ErrorOr.h"
11 #include "llvm/Support/Errc.h"
12 #include "gtest/gtest.h"
13 #include <memory>
14
15 using namespace llvm;
16
17 namespace {
18
t1()19 ErrorOr<int> t1() { return 1; }
t2()20 ErrorOr<int> t2() { return errc::invalid_argument; }
21
TEST(ErrorOr,SimpleValue)22 TEST(ErrorOr, SimpleValue) {
23 ErrorOr<int> a = t1();
24 // FIXME: This is probably a bug in gtest. EXPECT_TRUE should expand to
25 // include the !! to make it friendly to explicit bool operators.
26 EXPECT_TRUE(!!a);
27 EXPECT_EQ(1, *a);
28
29 ErrorOr<int> b = a;
30 EXPECT_EQ(1, *b);
31
32 a = t2();
33 EXPECT_FALSE(a);
34 EXPECT_EQ(a.getError(), errc::invalid_argument);
35 #ifdef EXPECT_DEBUG_DEATH
36 EXPECT_DEBUG_DEATH(*a, "Cannot get value when an error exists");
37 #endif
38 }
39
t3()40 ErrorOr<std::unique_ptr<int> > t3() {
41 return std::unique_ptr<int>(new int(3));
42 }
43
TEST(ErrorOr,Types)44 TEST(ErrorOr, Types) {
45 int x;
46 ErrorOr<int&> a(x);
47 *a = 42;
48 EXPECT_EQ(42, x);
49
50 // Move only types.
51 EXPECT_EQ(3, **t3());
52 }
53
54 struct B {};
55 struct D : B {};
56
TEST(ErrorOr,Covariant)57 TEST(ErrorOr, Covariant) {
58 ErrorOr<B*> b(ErrorOr<D*>(nullptr));
59 b = ErrorOr<D*>(nullptr);
60
61 ErrorOr<std::unique_ptr<B> > b1(ErrorOr<std::unique_ptr<D> >(nullptr));
62 b1 = ErrorOr<std::unique_ptr<D> >(nullptr);
63
64 ErrorOr<std::unique_ptr<int>> b2(ErrorOr<int *>(nullptr));
65 ErrorOr<int *> b3(nullptr);
66 ErrorOr<std::unique_ptr<int>> b4(b3);
67 }
68
TEST(ErrorOr,Comparison)69 TEST(ErrorOr, Comparison) {
70 ErrorOr<int> x(errc::no_such_file_or_directory);
71 EXPECT_EQ(x, errc::no_such_file_or_directory);
72 }
73
TEST(ErrorOr,ImplicitConversion)74 TEST(ErrorOr, ImplicitConversion) {
75 ErrorOr<std::string> x("string literal");
76 EXPECT_TRUE(!!x);
77 }
78
TEST(ErrorOr,ImplicitConversionCausesMove)79 TEST(ErrorOr, ImplicitConversionCausesMove) {
80 struct Source {};
81 struct Destination {
82 Destination(const Source&) {}
83 Destination(Source&&) = delete;
84 };
85 Source s;
86 ErrorOr<Destination> x = s;
87 EXPECT_TRUE(!!x);
88 }
89
TEST(ErrorOr,ImplicitConversionNoAmbiguity)90 TEST(ErrorOr, ImplicitConversionNoAmbiguity) {
91 struct CastsToErrorCode {
92 CastsToErrorCode() = default;
93 CastsToErrorCode(std::error_code) {}
94 operator std::error_code() { return errc::invalid_argument; }
95 } casts_to_error_code;
96 ErrorOr<CastsToErrorCode> x1(casts_to_error_code);
97 ErrorOr<CastsToErrorCode> x2 = casts_to_error_code;
98 ErrorOr<CastsToErrorCode> x3 = {casts_to_error_code};
99 ErrorOr<CastsToErrorCode> x4{casts_to_error_code};
100 ErrorOr<CastsToErrorCode> x5(errc::no_such_file_or_directory);
101 ErrorOr<CastsToErrorCode> x6 = errc::no_such_file_or_directory;
102 ErrorOr<CastsToErrorCode> x7 = {errc::no_such_file_or_directory};
103 ErrorOr<CastsToErrorCode> x8{errc::no_such_file_or_directory};
104 EXPECT_TRUE(!!x1);
105 EXPECT_TRUE(!!x2);
106 EXPECT_TRUE(!!x3);
107 EXPECT_TRUE(!!x4);
108 EXPECT_FALSE(x5);
109 EXPECT_FALSE(x6);
110 EXPECT_FALSE(x7);
111 EXPECT_FALSE(x8);
112 }
113
114 // ErrorOr<int*> x(nullptr);
115 // ErrorOr<std::unique_ptr<int>> y = x; // invalid conversion
116 static_assert(
117 !std::is_convertible<const ErrorOr<int *> &,
118 ErrorOr<std::unique_ptr<int>>>::value,
119 "do not invoke explicit ctors in implicit conversion from lvalue");
120
121 // ErrorOr<std::unique_ptr<int>> y = ErrorOr<int*>(nullptr); // invalid
122 // // conversion
123 static_assert(
124 !std::is_convertible<ErrorOr<int *> &&,
125 ErrorOr<std::unique_ptr<int>>>::value,
126 "do not invoke explicit ctors in implicit conversion from rvalue");
127
128 // ErrorOr<int*> x(nullptr);
129 // ErrorOr<std::unique_ptr<int>> y;
130 // y = x; // invalid conversion
131 static_assert(!std::is_assignable<ErrorOr<std::unique_ptr<int>>,
132 const ErrorOr<int *> &>::value,
133 "do not invoke explicit ctors in assignment");
134
135 // ErrorOr<std::unique_ptr<int>> x;
136 // x = ErrorOr<int*>(nullptr); // invalid conversion
137 static_assert(!std::is_assignable<ErrorOr<std::unique_ptr<int>>,
138 ErrorOr<int *> &&>::value,
139 "do not invoke explicit ctors in assignment");
140 } // end anon namespace
141