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llvm-mirror/unittests/ADT/OptionalTest.cpp
James Player 6207a8299f Fix llvm::Optional build breaks in MSVC using std::is_trivially_copyable 
Current code breaks this version of MSVC due to a mismatch between `std::is_trivially_copyable` and `llvm::is_trivially_copyable` for `std::pair` instantiations.  Hence I was attempting to use `std::is_trivially_copyable` to set `llvm::is_trivially_copyable<T>::value`.

I spent some time root causing an `llvm::Optional` build error on MSVC 16.8.3 related to the change described above:

```
62>C:\src\ocg_llvm\llvm-project\llvm\include\llvm/ADT/BreadthFirstIterator.h(96,12): error C2280: 'llvm::Optional<std::pair<std::pair<unsigned int,llvm::Graph<4>::NodeSubset> *,llvm::Optional<llvm::Graph<4>::ChildIterator>>> &llvm::Optional<std::pair<std::pair<unsigned int,llvm::Graph<4>::NodeSubset> *,llvm::Optional<llvm::Graph<4>::ChildIterator>>>::operator =(const llvm::Optional<std::pair<std::pair<unsigned int,llvm::Graph<4>::NodeSubset> *,llvm::Optional<llvm::Graph<4>::ChildIterator>>> &)': attempting to reference a deleted function (compiling source file C:\src\ocg_llvm\llvm-project\llvm\unittests\ADT\BreadthFirstIteratorTest.cpp)
...
```
The "trivial" specialization of `optional_detail::OptionalStorage` assumes that the value type is trivially copy constructible and trivially copy assignable. The specialization is invoked based on a check of `is_trivially_copyable` alone, which does not imply both `is_trivially_copy_assignable` and `is_trivially_copy_constructible` are true.

[[ https://en.cppreference.com/w/cpp/named_req/TriviallyCopyable | According to the spec ]], a deleted assignment operator does not make `is_trivially_copyable` false. So I think all these properties need to be checked explicitly in order to specialize `OptionalStorage` to the "trivial" version:
```
/// Storage for any type.
template <typename T, bool = std::is_trivially_copy_constructible<T>::value
                          && std::is_trivially_copy_assignable<T>::value>
class OptionalStorage {
```
Above fixed my build break in MSVC, but I think we need to explicitly check `is_trivially_copy_constructible` too since it might be possible the copy constructor is deleted.  Also would be ideal to move over to `std::is_trivially_copyable` instead of the `llvm` namespace verson.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D93510
2021-01-16 09:37:04 -05:00

758 lines
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//===- llvm/unittest/ADT/OptionalTest.cpp - Optional unit tests -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/raw_ostream.h"
#include "gtest/gtest-spi.h"
#include "gtest/gtest.h"
#include <array>
using namespace llvm;
static_assert(std::is_trivially_copyable<Optional<int>>::value,
"trivially copyable");
static_assert(std::is_trivially_copyable<Optional<std::array<int, 3>>>::value,
"trivially copyable");
void OptionalWorksInConstexpr() {
constexpr auto x1 = Optional<int>();
constexpr Optional<int> x2{};
static_assert(!x1.hasValue() && !x2.hasValue(),
"Default construction and hasValue() are contexpr");
constexpr auto y1 = Optional<int>(3);
constexpr Optional<int> y2{3};
static_assert(y1.getValue() == y2.getValue() && y1.getValue() == 3,
"Construction with value and getValue() are constexpr");
static_assert(Optional<int>{3} >= 2 && Optional<int>{1} < Optional<int>{2},
"Comparisons work in constexpr");
}
namespace {
struct NonDefaultConstructible {
static unsigned CopyConstructions;
static unsigned Destructions;
static unsigned CopyAssignments;
explicit NonDefaultConstructible(int) {
}
NonDefaultConstructible(const NonDefaultConstructible&) {
++CopyConstructions;
}
NonDefaultConstructible &operator=(const NonDefaultConstructible&) {
++CopyAssignments;
return *this;
}
~NonDefaultConstructible() {
++Destructions;
}
static void ResetCounts() {
CopyConstructions = 0;
Destructions = 0;
CopyAssignments = 0;
}
};
unsigned NonDefaultConstructible::CopyConstructions = 0;
unsigned NonDefaultConstructible::Destructions = 0;
unsigned NonDefaultConstructible::CopyAssignments = 0;
static_assert(
!std::is_trivially_copyable<Optional<NonDefaultConstructible>>::value,
"not trivially copyable");
TEST(OptionalTest, NonDefaultConstructibleTest) {
Optional<NonDefaultConstructible> O;
EXPECT_FALSE(O);
}
TEST(OptionalTest, ResetTest) {
NonDefaultConstructible::ResetCounts();
Optional<NonDefaultConstructible> O(NonDefaultConstructible(3));
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
O.reset();
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
}
TEST(OptionalTest, InitializationLeakTest) {
NonDefaultConstructible::ResetCounts();
Optional<NonDefaultConstructible>(NonDefaultConstructible(3));
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
}
TEST(OptionalTest, CopyConstructionTest) {
NonDefaultConstructible::ResetCounts();
{
Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
Optional<NonDefaultConstructible> B(A);
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
}
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
}
TEST(OptionalTest, ConstructingCopyAssignmentTest) {
NonDefaultConstructible::ResetCounts();
{
Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
Optional<NonDefaultConstructible> B;
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
B = A;
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
}
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
}
TEST(OptionalTest, CopyingCopyAssignmentTest) {
NonDefaultConstructible::ResetCounts();
{
Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
Optional<NonDefaultConstructible> B(NonDefaultConstructible(4));
EXPECT_EQ(2u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
B = A;
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(1u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
}
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
}
TEST(OptionalTest, DeletingCopyAssignmentTest) {
NonDefaultConstructible::ResetCounts();
{
Optional<NonDefaultConstructible> A;
Optional<NonDefaultConstructible> B(NonDefaultConstructible(3));
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
B = A;
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
}
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
}
TEST(OptionalTest, NullCopyConstructionTest) {
NonDefaultConstructible::ResetCounts();
{
Optional<NonDefaultConstructible> A;
Optional<NonDefaultConstructible> B;
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
B = A;
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
NonDefaultConstructible::ResetCounts();
}
EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
}
TEST(OptionalTest, GetValueOr) {
Optional<int> A;
EXPECT_EQ(42, A.getValueOr(42));
A = 5;
EXPECT_EQ(5, A.getValueOr(42));
}
struct MultiArgConstructor {
int x, y;
MultiArgConstructor(int x, int y) : x(x), y(y) {}
explicit MultiArgConstructor(int x, bool positive)
: x(x), y(positive ? x : -x) {}
MultiArgConstructor(const MultiArgConstructor &) = delete;
MultiArgConstructor(MultiArgConstructor &&) = delete;
MultiArgConstructor &operator=(const MultiArgConstructor &) = delete;
MultiArgConstructor &operator=(MultiArgConstructor &&) = delete;
static unsigned Destructions;
~MultiArgConstructor() {
++Destructions;
}
static void ResetCounts() {
Destructions = 0;
}
};
unsigned MultiArgConstructor::Destructions = 0;
static_assert(!std::is_trivially_copyable<Optional<MultiArgConstructor>>::value,
"not trivially copyable");
TEST(OptionalTest, Emplace) {
MultiArgConstructor::ResetCounts();
Optional<MultiArgConstructor> A;
A.emplace(1, 2);
EXPECT_TRUE(A.hasValue());
EXPECT_EQ(1, A->x);
EXPECT_EQ(2, A->y);
EXPECT_EQ(0u, MultiArgConstructor::Destructions);
A.emplace(5, false);
EXPECT_TRUE(A.hasValue());
EXPECT_EQ(5, A->x);
EXPECT_EQ(-5, A->y);
EXPECT_EQ(1u, MultiArgConstructor::Destructions);
}
struct MoveOnly {
static unsigned MoveConstructions;
static unsigned Destructions;
static unsigned MoveAssignments;
int val;
explicit MoveOnly(int val) : val(val) {
}
MoveOnly(MoveOnly&& other) {
val = other.val;
++MoveConstructions;
}
MoveOnly &operator=(MoveOnly&& other) {
val = other.val;
++MoveAssignments;
return *this;
}
~MoveOnly() {
++Destructions;
}
static void ResetCounts() {
MoveConstructions = 0;
Destructions = 0;
MoveAssignments = 0;
}
};
unsigned MoveOnly::MoveConstructions = 0;
unsigned MoveOnly::Destructions = 0;
unsigned MoveOnly::MoveAssignments = 0;
static_assert(!std::is_trivially_copyable<Optional<MoveOnly>>::value,
"not trivially copyable");
TEST(OptionalTest, MoveOnlyNull) {
MoveOnly::ResetCounts();
Optional<MoveOnly> O;
EXPECT_EQ(0u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(0u, MoveOnly::Destructions);
}
TEST(OptionalTest, MoveOnlyConstruction) {
MoveOnly::ResetCounts();
Optional<MoveOnly> O(MoveOnly(3));
EXPECT_TRUE((bool)O);
EXPECT_EQ(3, O->val);
EXPECT_EQ(1u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(1u, MoveOnly::Destructions);
}
TEST(OptionalTest, MoveOnlyMoveConstruction) {
Optional<MoveOnly> A(MoveOnly(3));
MoveOnly::ResetCounts();
Optional<MoveOnly> B(std::move(A));
EXPECT_TRUE((bool)A);
EXPECT_TRUE((bool)B);
EXPECT_EQ(3, B->val);
EXPECT_EQ(1u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(0u, MoveOnly::Destructions);
}
TEST(OptionalTest, MoveOnlyAssignment) {
MoveOnly::ResetCounts();
Optional<MoveOnly> O;
O = MoveOnly(3);
EXPECT_TRUE((bool)O);
EXPECT_EQ(3, O->val);
EXPECT_EQ(1u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(1u, MoveOnly::Destructions);
}
TEST(OptionalTest, MoveOnlyInitializingAssignment) {
Optional<MoveOnly> A(MoveOnly(3));
Optional<MoveOnly> B;
MoveOnly::ResetCounts();
B = std::move(A);
EXPECT_TRUE((bool)A);
EXPECT_TRUE((bool)B);
EXPECT_EQ(3, B->val);
EXPECT_EQ(1u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(0u, MoveOnly::Destructions);
}
TEST(OptionalTest, MoveOnlyNullingAssignment) {
Optional<MoveOnly> A;
Optional<MoveOnly> B(MoveOnly(3));
MoveOnly::ResetCounts();
B = std::move(A);
EXPECT_FALSE((bool)A);
EXPECT_FALSE((bool)B);
EXPECT_EQ(0u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(1u, MoveOnly::Destructions);
}
TEST(OptionalTest, MoveOnlyAssigningAssignment) {
Optional<MoveOnly> A(MoveOnly(3));
Optional<MoveOnly> B(MoveOnly(4));
MoveOnly::ResetCounts();
B = std::move(A);
EXPECT_TRUE((bool)A);
EXPECT_TRUE((bool)B);
EXPECT_EQ(3, B->val);
EXPECT_EQ(0u, MoveOnly::MoveConstructions);
EXPECT_EQ(1u, MoveOnly::MoveAssignments);
EXPECT_EQ(0u, MoveOnly::Destructions);
}
struct Immovable {
static unsigned Constructions;
static unsigned Destructions;
int val;
explicit Immovable(int val) : val(val) {
++Constructions;
}
~Immovable() {
++Destructions;
}
static void ResetCounts() {
Constructions = 0;
Destructions = 0;
}
private:
// This should disable all move/copy operations.
Immovable(Immovable&& other) = delete;
};
unsigned Immovable::Constructions = 0;
unsigned Immovable::Destructions = 0;
static_assert(!std::is_trivially_copyable<Optional<Immovable>>::value,
"not trivially copyable");
TEST(OptionalTest, ImmovableEmplace) {
Optional<Immovable> A;
Immovable::ResetCounts();
A.emplace(4);
EXPECT_TRUE((bool)A);
EXPECT_EQ(4, A->val);
EXPECT_EQ(1u, Immovable::Constructions);
EXPECT_EQ(0u, Immovable::Destructions);
}
// Craft a class which is_trivially_copyable, but not
// is_trivially_copy_constructible.
struct NonTCopy {
NonTCopy() = default;
// Delete the volatile copy constructor to engage the "rule of 3" and delete
// any unspecified copy assignment or constructor.
NonTCopy(volatile NonTCopy const &) = delete;
// Leave the non-volatile default copy constructor unspecified (deleted by
// rule of 3)
// This template can serve as the copy constructor, but isn't chosen
// by =default in a class with a 'NonTCopy' member.
template <typename Self = NonTCopy>
NonTCopy(Self const &Other) : Val(Other.Val) {}
NonTCopy &operator=(NonTCopy const &) = default;
int Val{0};
};
#if defined(_MSC_VER) && _MSC_VER >= 1927 && !defined(__clang__)
// Currently only true on recent MSVC releases.
static_assert(std::is_trivially_copyable<NonTCopy>::value,
"Expect NonTCopy to be trivially copyable");
static_assert(!std::is_trivially_copy_constructible<NonTCopy>::value,
"Expect NonTCopy not to be trivially copy constructible.");
#endif // defined(_MSC_VER) && _MSC_VER >= 1927
TEST(OptionalTest, DeletedCopyConstructor) {
// Expect compile to fail if 'trivial' version of
// optional_detail::OptionalStorage is chosen.
using NonTCopyOptT = Optional<NonTCopy>;
NonTCopyOptT NonTCopy1;
// Check that the Optional can be copy constructed.
NonTCopyOptT NonTCopy2{NonTCopy1};
// Check that the Optional can be copy assigned.
NonTCopy1 = NonTCopy2;
}
// Craft a class which is_trivially_copyable, but not
// is_trivially_copy_assignable.
class NonTAssign {
public:
NonTAssign() = default;
NonTAssign(NonTAssign const &) = default;
// Delete the volatile copy assignment to engage the "rule of 3" and delete
// any unspecified copy assignment or constructor.
NonTAssign &operator=(volatile NonTAssign const &) = delete;
// Leave the non-volatile default copy assignment unspecified (deleted by rule
// of 3).
// This template can serve as the copy assignment, but isn't chosen
// by =default in a class with a 'NonTAssign' member.
template <typename Self = NonTAssign>
NonTAssign &operator=(Self const &Other) {
A = Other.A;
return *this;
}
int A{0};
};
#if defined(_MSC_VER) && _MSC_VER >= 1927 && !defined(__clang__)
// Currently only true on recent MSVC releases.
static_assert(std::is_trivially_copyable<NonTAssign>::value,
"Expect NonTAssign to be trivially copyable");
static_assert(!std::is_trivially_copy_assignable<NonTAssign>::value,
"Expect NonTAssign not to be trivially assignable.");
#endif // defined(_MSC_VER) && _MSC_VER >= 1927
TEST(OptionalTest, DeletedCopyAssignment) {
// Expect compile to fail if 'trivial' version of
// optional_detail::OptionalStorage is chosen.
using NonTAssignOptT = Optional<NonTAssign>;
NonTAssignOptT NonTAssign1;
// Check that the Optional can be copy constructed.
NonTAssignOptT NonTAssign2{NonTAssign1};
// Check that the Optional can be copy assigned.
NonTAssign1 = NonTAssign2;
}
struct NoTMove {
NoTMove() = default;
NoTMove(NoTMove const &) = default;
NoTMove &operator=(NoTMove const &) = default;
// Delete move constructor / assignment. Compiler should fall-back to the
// trivial copy constructor / assignment in the trivial OptionalStorage
// specialization.
NoTMove(NoTMove &&) = delete;
NoTMove &operator=(NoTMove &&) = delete;
int Val{0};
};
TEST(OptionalTest, DeletedMoveConstructor) {
using NoTMoveOptT = Optional<NoTMove>;
NoTMoveOptT NonTMove1;
NoTMoveOptT NonTMove2{std::move(NonTMove1)};
NonTMove1 = std::move(NonTMove2);
static_assert(
std::is_trivially_copyable<NoTMoveOptT>::value,
"Expect Optional<NoTMove> to still use the trivial specialization "
"of OptionalStorage despite the deleted move constructor / assignment.");
}
class NoCopyStringMap {
public:
NoCopyStringMap() = default;
private:
llvm::StringMap<std::unique_ptr<int>> Map;
};
TEST(OptionalTest, DeletedCopyStringMap) {
// Old versions of gcc (7.3 and prior) instantiate the copy constructor when
// std::is_trivially_copyable is instantiated. This test will fail
// compilation if std::is_trivially_copyable is used in the OptionalStorage
// specialization condition by gcc <= 7.3.
Optional<NoCopyStringMap> TestInstantiation;
}
#if LLVM_HAS_RVALUE_REFERENCE_THIS
TEST(OptionalTest, MoveGetValueOr) {
Optional<MoveOnly> A;
MoveOnly::ResetCounts();
EXPECT_EQ(42, std::move(A).getValueOr(MoveOnly(42)).val);
EXPECT_EQ(1u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(2u, MoveOnly::Destructions);
A = MoveOnly(5);
MoveOnly::ResetCounts();
EXPECT_EQ(5, std::move(A).getValueOr(MoveOnly(42)).val);
EXPECT_EQ(1u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(2u, MoveOnly::Destructions);
}
#endif // LLVM_HAS_RVALUE_REFERENCE_THIS
struct EqualTo {
template <typename T, typename U> static bool apply(const T &X, const U &Y) {
return X == Y;
}
};
struct NotEqualTo {
template <typename T, typename U> static bool apply(const T &X, const U &Y) {
return X != Y;
}
};
struct Less {
template <typename T, typename U> static bool apply(const T &X, const U &Y) {
return X < Y;
}
};
struct Greater {
template <typename T, typename U> static bool apply(const T &X, const U &Y) {
return X > Y;
}
};
struct LessEqual {
template <typename T, typename U> static bool apply(const T &X, const U &Y) {
return X <= Y;
}
};
struct GreaterEqual {
template <typename T, typename U> static bool apply(const T &X, const U &Y) {
return X >= Y;
}
};
template <typename OperatorT, typename T>
void CheckRelation(const Optional<T> &Lhs, const Optional<T> &Rhs,
bool Expected) {
EXPECT_EQ(Expected, OperatorT::apply(Lhs, Rhs));
if (Lhs)
EXPECT_EQ(Expected, OperatorT::apply(*Lhs, Rhs));
else
EXPECT_EQ(Expected, OperatorT::apply(None, Rhs));
if (Rhs)
EXPECT_EQ(Expected, OperatorT::apply(Lhs, *Rhs));
else
EXPECT_EQ(Expected, OperatorT::apply(Lhs, None));
}
struct EqualityMock {};
const Optional<EqualityMock> NoneEq, EqualityLhs((EqualityMock())),
EqualityRhs((EqualityMock()));
bool IsEqual;
bool operator==(const EqualityMock &Lhs, const EqualityMock &Rhs) {
EXPECT_EQ(&*EqualityLhs, &Lhs);
EXPECT_EQ(&*EqualityRhs, &Rhs);
return IsEqual;
}
TEST(OptionalTest, OperatorEqual) {
CheckRelation<EqualTo>(NoneEq, NoneEq, true);
CheckRelation<EqualTo>(NoneEq, EqualityRhs, false);
CheckRelation<EqualTo>(EqualityLhs, NoneEq, false);
IsEqual = false;
CheckRelation<EqualTo>(EqualityLhs, EqualityRhs, IsEqual);
IsEqual = true;
CheckRelation<EqualTo>(EqualityLhs, EqualityRhs, IsEqual);
}
TEST(OptionalTest, OperatorNotEqual) {
CheckRelation<NotEqualTo>(NoneEq, NoneEq, false);
CheckRelation<NotEqualTo>(NoneEq, EqualityRhs, true);
CheckRelation<NotEqualTo>(EqualityLhs, NoneEq, true);
IsEqual = false;
CheckRelation<NotEqualTo>(EqualityLhs, EqualityRhs, !IsEqual);
IsEqual = true;
CheckRelation<NotEqualTo>(EqualityLhs, EqualityRhs, !IsEqual);
}
struct InequalityMock {};
const Optional<InequalityMock> NoneIneq, InequalityLhs((InequalityMock())),
InequalityRhs((InequalityMock()));
bool IsLess;
bool operator<(const InequalityMock &Lhs, const InequalityMock &Rhs) {
EXPECT_EQ(&*InequalityLhs, &Lhs);
EXPECT_EQ(&*InequalityRhs, &Rhs);
return IsLess;
}
TEST(OptionalTest, OperatorLess) {
CheckRelation<Less>(NoneIneq, NoneIneq, false);
CheckRelation<Less>(NoneIneq, InequalityRhs, true);
CheckRelation<Less>(InequalityLhs, NoneIneq, false);
IsLess = false;
CheckRelation<Less>(InequalityLhs, InequalityRhs, IsLess);
IsLess = true;
CheckRelation<Less>(InequalityLhs, InequalityRhs, IsLess);
}
TEST(OptionalTest, OperatorGreater) {
CheckRelation<Greater>(NoneIneq, NoneIneq, false);
CheckRelation<Greater>(NoneIneq, InequalityRhs, false);
CheckRelation<Greater>(InequalityLhs, NoneIneq, true);
IsLess = false;
CheckRelation<Greater>(InequalityRhs, InequalityLhs, IsLess);
IsLess = true;
CheckRelation<Greater>(InequalityRhs, InequalityLhs, IsLess);
}
TEST(OptionalTest, OperatorLessEqual) {
CheckRelation<LessEqual>(NoneIneq, NoneIneq, true);
CheckRelation<LessEqual>(NoneIneq, InequalityRhs, true);
CheckRelation<LessEqual>(InequalityLhs, NoneIneq, false);
IsLess = false;
CheckRelation<LessEqual>(InequalityRhs, InequalityLhs, !IsLess);
IsLess = true;
CheckRelation<LessEqual>(InequalityRhs, InequalityLhs, !IsLess);
}
TEST(OptionalTest, OperatorGreaterEqual) {
CheckRelation<GreaterEqual>(NoneIneq, NoneIneq, true);
CheckRelation<GreaterEqual>(NoneIneq, InequalityRhs, false);
CheckRelation<GreaterEqual>(InequalityLhs, NoneIneq, true);
IsLess = false;
CheckRelation<GreaterEqual>(InequalityLhs, InequalityRhs, !IsLess);
IsLess = true;
CheckRelation<GreaterEqual>(InequalityLhs, InequalityRhs, !IsLess);
}
struct ComparableAndStreamable {
friend bool operator==(ComparableAndStreamable,
ComparableAndStreamable) LLVM_ATTRIBUTE_USED {
return true;
}
friend raw_ostream &operator<<(raw_ostream &OS, ComparableAndStreamable) {
return OS << "ComparableAndStreamable";
}
static Optional<ComparableAndStreamable> get() {
return ComparableAndStreamable();
}
};
TEST(OptionalTest, StreamOperator) {
auto to_string = [](Optional<ComparableAndStreamable> O) {
SmallString<16> S;
raw_svector_ostream OS(S);
OS << O;
return S;
};
EXPECT_EQ("ComparableAndStreamable",
to_string(ComparableAndStreamable::get()));
EXPECT_EQ("None", to_string(None));
}
struct Comparable {
friend bool operator==(Comparable, Comparable) LLVM_ATTRIBUTE_USED {
return true;
}
static Optional<Comparable> get() { return Comparable(); }
};
TEST(OptionalTest, UseInUnitTests) {
// Test that we invoke the streaming operators when pretty-printing values in
// EXPECT macros.
EXPECT_NONFATAL_FAILURE(EXPECT_EQ(llvm::None, ComparableAndStreamable::get()),
"Expected: llvm::None\n"
" Which is: None\n"
"To be equal to: ComparableAndStreamable::get()\n"
" Which is: ComparableAndStreamable");
// Test that it is still possible to compare objects which do not have a
// custom streaming operator.
EXPECT_NONFATAL_FAILURE(EXPECT_EQ(llvm::None, Comparable::get()), "object");
}
TEST(OptionalTest, HashValue) {
// Check that None, false, and true all hash differently.
Optional<bool> B, B0 = false, B1 = true;
EXPECT_NE(hash_value(B0), hash_value(B));
EXPECT_NE(hash_value(B1), hash_value(B));
EXPECT_NE(hash_value(B1), hash_value(B0));
// Check that None, 0, and 1 all hash differently.
Optional<int> I, I0 = 0, I1 = 1;
EXPECT_NE(hash_value(I0), hash_value(I));
EXPECT_NE(hash_value(I1), hash_value(I));
EXPECT_NE(hash_value(I1), hash_value(I0));
// Check None hash the same way regardless of type.
EXPECT_EQ(hash_value(B), hash_value(I));
}
} // end anonymous namespace
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