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 19 ErrorOr<int> t1() {return 1;} 20 ErrorOr<int> t2() { return errc::invalid_argument; } 21 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 40 ErrorOr<std::unique_ptr<int> > t3() { 41 return std::unique_ptr<int>(new int(3)); 42 } 43 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 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 69 // ErrorOr<int*> x(nullptr); 70 // ErrorOr<std::unique_ptr<int>> y = x; // invalid conversion 71 static_assert( 72 !std::is_convertible<const ErrorOr<int *> &, 73 ErrorOr<std::unique_ptr<int>>>::value, 74 "do not invoke explicit ctors in implicit conversion from lvalue"); 75 76 // ErrorOr<std::unique_ptr<int>> y = ErrorOr<int*>(nullptr); // invalid 77 // // conversion 78 static_assert( 79 !std::is_convertible<ErrorOr<int *> &&, 80 ErrorOr<std::unique_ptr<int>>>::value, 81 "do not invoke explicit ctors in implicit conversion from rvalue"); 82 83 // ErrorOr<int*> x(nullptr); 84 // ErrorOr<std::unique_ptr<int>> y; 85 // y = x; // invalid conversion 86 static_assert(!std::is_assignable<ErrorOr<std::unique_ptr<int>>, 87 const ErrorOr<int *> &>::value, 88 "do not invoke explicit ctors in assignment"); 89 90 // ErrorOr<std::unique_ptr<int>> x; 91 // x = ErrorOr<int*>(nullptr); // invalid conversion 92 static_assert(!std::is_assignable<ErrorOr<std::unique_ptr<int>>, 93 ErrorOr<int *> &&>::value, 94 "do not invoke explicit ctors in assignment"); 95 } // end anon namespace 96