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 "gtest/gtest.h"
12 #include <memory>
13 
14 using namespace llvm;
15 
16 namespace {
17 
18 ErrorOr<int> t1() {return 1;}
19 ErrorOr<int> t2() { return errc::invalid_argument; }
20 
21 TEST(ErrorOr, SimpleValue) {
22   ErrorOr<int> a = t1();
23   EXPECT_TRUE(a);
24   EXPECT_EQ(1, *a);
25 
26   a = t2();
27   EXPECT_FALSE(a);
28   EXPECT_EQ(errc::invalid_argument, a);
29 #ifdef EXPECT_DEBUG_DEATH
30   EXPECT_DEBUG_DEATH(*a, "Cannot get value when an error exists");
31 #endif
32 }
33 
34 #if LLVM_HAS_CXX11_STDLIB
35 ErrorOr<std::unique_ptr<int> > t3() {
36   return std::unique_ptr<int>(new int(3));
37 }
38 #endif
39 
40 TEST(ErrorOr, Types) {
41   int x;
42   ErrorOr<int&> a(x);
43   *a = 42;
44   EXPECT_EQ(42, x);
45 
46 #if LLVM_HAS_CXX11_STDLIB
47   // Move only types.
48   EXPECT_EQ(3, **t3());
49 #endif
50 }
51 
52 struct B {};
53 struct D : B {};
54 
55 TEST(ErrorOr, Covariant) {
56   ErrorOr<B*> b(ErrorOr<D*>(0));
57   b = ErrorOr<D*>(0);
58 
59 #if LLVM_HAS_CXX11_STDLIB
60   ErrorOr<std::unique_ptr<B> > b1(ErrorOr<std::unique_ptr<D> >(0));
61   b1 = ErrorOr<std::unique_ptr<D> >(0);
62 #endif
63 }
64 } // end anon namespace
65