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llvm-mirror/unittests/ADT/OptionalTest.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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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/Support/raw_ostream.h"
#include "gtest/gtest-spi.h"
#include "gtest/gtest.h"
using namespace llvm;
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;
// Test fixture
class OptionalTest : public testing::Test {
};
TEST_F(OptionalTest, NonDefaultConstructibleTest) {
Optional<NonDefaultConstructible> O;
EXPECT_FALSE(O);
}
TEST_F(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_F(OptionalTest, InitializationLeakTest) {
NonDefaultConstructible::ResetCounts();
Optional<NonDefaultConstructible>(NonDefaultConstructible(3));
EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
}
TEST_F(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_F(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_F(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_F(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_F(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_F(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;
TEST_F(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;
TEST_F(OptionalTest, MoveOnlyNull) {
MoveOnly::ResetCounts();
Optional<MoveOnly> O;
EXPECT_EQ(0u, MoveOnly::MoveConstructions);
EXPECT_EQ(0u, MoveOnly::MoveAssignments);
EXPECT_EQ(0u, MoveOnly::Destructions);
}
TEST_F(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_F(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_F(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_F(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_F(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_F(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;
TEST_F(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);
}
#if LLVM_HAS_RVALUE_REFERENCE_THIS
TEST_F(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_F(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_F(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_F(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_F(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_F(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_F(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_F(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_F(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()),
R"(Expected: llvm::None
Which is: None
To be equal to: ComparableAndStreamable::get()
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");
}
} // end anonymous namespace
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