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Add assignment operators

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This commit is contained in:
Sebastian Messmer 2015-06-26 01:59:29 +02:00
parent d5dadc74e7
commit 396dbcfc1c
2 changed files with 157 additions and 33 deletions
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65
either.h
View File

@ -11,48 +11,61 @@ namespace cpputils {
public:
//TODO Try allowing construction with any type that std::is_convertible to Left or Right.
Either(const Left &left): _side(Side::left) {
new(&_left)Left(left);
_construct_left(left);
}
Either(Left &&left): _side(Side::left) {
new(&_left)Left(std::move(left));
_construct_left(std::move(left));
}
Either(const Right &right): _side(Side::right) {
new(&_right)Right(right);
_construct_right(right);
}
Either(Right &&right): _side(Side::right) {
new(&_right)Right(std::move(right));
_construct_right(std::move(right));
}
//TODO Try allowing copy-construction when Left/Right types are std::is_convertible
Either(const Either<Left, Right> &rhs): _side(rhs._side) {
if(_side == Side::left) {
new(&_left)Left(rhs._left);
_construct_left(rhs._left);
} else {
new(&_right)Right(rhs._right);
_construct_right(rhs._right);
}
}
Either(Either<Left, Right> &&rhs): _side(rhs._side) {
if(_side == Side::left) {
new(&_left)Left(std::move(rhs._left));
_construct_left(std::move(rhs._left));
} else {
new(&_right)Right(std::move(rhs._right));
_construct_right(std::move(rhs._right));
}
}
~Either() {
_destruct();
}
//TODO Try allowing copy-assignment when Left/Right types are std::is_convertible
Either<Left, Right> &operator=(const Either<Left, Right> &rhs) {
_destruct();
_side = rhs._side;
if (_side == Side::left) {
_left.~Left();
_construct_left(rhs._left);
} else {
_right.~Right();
_construct_right(rhs._right);
}
return *this;
}
//TODO Test copy assignment operator
//TODO Copy assignment operator
//TODO Test destruction after copy assignment
Either<Left, Right> &operator=(Either<Left, Right> &&rhs) {
_destruct();
_side = rhs._side;
if (_side == Side::left) {
_construct_left(std::move(rhs._left));
} else {
_construct_right(std::move(rhs._right));
}
return *this;
}
//TODO Test move assignment operator
//TODO Move assignment operator
//TODO Test destruction after move assignment
//TODO fold, map_left, map_right, left_or_else(val), right_or_else(val), left_or_else(func), right_or_else(func)
//TODO Test operator<<
//TODO operator<<(ostream)
@ -115,6 +128,26 @@ namespace cpputils {
Right _right;
};
enum class Side : unsigned char {left, right} _side;
void _construct_left(const Left &left) {
new(&_left)Left(left);
}
void _construct_left(Left &&left) {
new(&_left)Left(std::move(left));
}
void _construct_right(const Right &right) {
new(&_right)Right(right);
}
void _construct_right(Right &&right) {
new(&_right)Right(std::move(right));
}
void _destruct() {
if (_side == Side::left) {
_left.~Left();
} else {
_right.~Right();
}
}
};
template<class Left, class Right>

117
test/EitherTest.cpp
View File

@ -173,6 +173,34 @@ TEST_F(EitherTest, RightCanBeMoved) {
EXPECT_EQ(5, val2.right().value);
}
TEST_F(EitherTest, LeftCanBeAssigned) {
Either<string, int> val = string("string");
Either<string, int> val2 = string("otherstring");
val2 = val;
EXPECT_LEFT_IS("string", val2);
}
TEST_F(EitherTest, RightCanBeAssigned) {
Either<int, string> val = string("string");
Either<int, string> val2 = string("otherstring");
val2 = val;
EXPECT_RIGHT_IS("string", val2);
}
TEST_F(EitherTest, LeftCanBeMoveAssigned) {
Either<OnlyMoveable, int> val = OnlyMoveable(3);
Either<OnlyMoveable, int> val2 = OnlyMoveable(4);
val2 = std::move(val);
EXPECT_EQ(3, val2.left().value);
}
TEST_F(EitherTest, RightCanBeMoveAssigned) {
Either<int, OnlyMoveable> val = OnlyMoveable(3);
Either<int, OnlyMoveable> val2 = OnlyMoveable(4);
val2 = std::move(val);
EXPECT_EQ(3, val2.right().value);
}
TEST_F(EitherTest, ModifyLeft) {
Either<string, int> val = string("mystring1");
val.left() = "mystring2";
@ -245,10 +273,15 @@ TEST_F(EitherTest, LeftNotEqualsRight) {
class DestructorCallback {
public:
MOCK_CONST_METHOD0(call, void());
void EXPECT_CALLED(int times = 1) {
EXPECT_CALL(*this, call()).Times(times);
}
};
class ClassWithDestructorCallback {
public:
ClassWithDestructorCallback(const DestructorCallback *destructorCallback) : _destructorCallback(destructorCallback) { }
ClassWithDestructorCallback(const DestructorCallback *destructorCallback) : _destructorCallback(destructorCallback) {}
ClassWithDestructorCallback(const ClassWithDestructorCallback &rhs): _destructorCallback(rhs._destructorCallback) {}
~ClassWithDestructorCallback() {
_destructorCallback->call();
@ -272,50 +305,108 @@ private:
};
class EitherTest_Destructor: public EitherTest {
public:
DestructorCallback destructorCallback;
void EXPECT_DESTRUCTOR_CALLED(int times = 1) {
EXPECT_CALL(destructorCallback, call()).Times(times);
}
};
TEST_F(EitherTest_Destructor, LeftDestructorIsCalled) {
DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(2); //Once for the temp object, once when the either class destructs
ClassWithDestructorCallback temp(&destructorCallback);
Either<ClassWithDestructorCallback, string> var = temp;
EXPECT_DESTRUCTOR_CALLED(2); //Once for the temp object, once when the either class destructs
}
TEST_F(EitherTest_Destructor, RightDestructorIsCalled) {
DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(2); //Once for the temp object, once when the either class destructs
ClassWithDestructorCallback temp(&destructorCallback);
Either<string, ClassWithDestructorCallback> var = temp;
EXPECT_DESTRUCTOR_CALLED(2); //Once for the temp object, once when the either class destructs
}
TEST_F(EitherTest_Destructor, LeftDestructorIsCalledAfterCopying) {
DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
ClassWithDestructorCallback temp(&destructorCallback);
Either<ClassWithDestructorCallback, string> var1 = temp;
Either<ClassWithDestructorCallback, string> var2 = var1;
EXPECT_DESTRUCTOR_CALLED(3); //Once for the temp object, once for var1 and once for var2
}
TEST_F(EitherTest_Destructor, RightDestructorIsCalledAfterCopying) {
DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
ClassWithDestructorCallback temp(&destructorCallback);
Either<string, ClassWithDestructorCallback> var1 = temp;
Either<string, ClassWithDestructorCallback> var2 = var1;
EXPECT_DESTRUCTOR_CALLED(3); //Once for the temp object, once for var1 and once for var2
}
TEST_F(EitherTest_Destructor, LeftDestructorIsCalledAfterMoving) {
DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
OnlyMoveableClassWithDestructorCallback temp(&destructorCallback);
Either<OnlyMoveableClassWithDestructorCallback, string> var1 = std::move(temp);
Either<OnlyMoveableClassWithDestructorCallback, string> var2 = std::move(var1);
EXPECT_DESTRUCTOR_CALLED(3); //Once for the temp object, once for var1 and once for var2
}
TEST_F(EitherTest_Destructor, RightDestructorIsCalledAfterMoving) {
DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
OnlyMoveableClassWithDestructorCallback temp(&destructorCallback);
Either<string, OnlyMoveableClassWithDestructorCallback> var1 = std::move(temp);
Either<string, OnlyMoveableClassWithDestructorCallback> var2 = std::move(var1);
EXPECT_DESTRUCTOR_CALLED(3); //Once for the temp object, once for var1 and once for var2
}
TEST_F(EitherTest_Destructor, LeftDestructorIsCalledAfterAssignment) {
DestructorCallback destructorCallback1;
DestructorCallback destructorCallback2;
destructorCallback1.EXPECT_CALLED(2); //Once for the temp1 object, once at the assignment
destructorCallback2.EXPECT_CALLED(3); //Once for the temp2 object, once in destructor of var2, once in destructor of var1
ClassWithDestructorCallback temp1(&destructorCallback1);
Either<ClassWithDestructorCallback, string> var1 = temp1;
ClassWithDestructorCallback temp2(&destructorCallback2);
Either<ClassWithDestructorCallback, string> var2 = temp2;
var1 = var2;
}
TEST_F(EitherTest_Destructor, RightDestructorIsCalledAfterAssignment) {
DestructorCallback destructorCallback1;
DestructorCallback destructorCallback2;
destructorCallback1.EXPECT_CALLED(2); //Once for the temp1 object, once at the assignment
destructorCallback2.EXPECT_CALLED(3); //Once for the temp2 object, once in destructor of var2, once in destructor of var1
ClassWithDestructorCallback temp1(&destructorCallback1);
Either<string, ClassWithDestructorCallback> var1 = temp1;
ClassWithDestructorCallback temp2(&destructorCallback2);
Either<string, ClassWithDestructorCallback> var2 = temp2;
var1 = var2;
}
TEST_F(EitherTest_Destructor, LeftDestructorIsCalledAfterMoveAssignment) {
DestructorCallback destructorCallback1;
DestructorCallback destructorCallback2;
destructorCallback1.EXPECT_CALLED(2); //Once for the temp1 object, once at the assignment
destructorCallback2.EXPECT_CALLED(3); //Once for the temp2 object, once in destructor of var2, once in destructor of var1
OnlyMoveableClassWithDestructorCallback temp1(&destructorCallback1);
Either<OnlyMoveableClassWithDestructorCallback, string> var1 = std::move(temp1);
OnlyMoveableClassWithDestructorCallback temp2(&destructorCallback2);
Either<OnlyMoveableClassWithDestructorCallback, string> var2 = std::move(temp2);
var1 = std::move(var2);
}
TEST_F(EitherTest_Destructor, RightDestructorIsCalledAfterMoveAssignment) {
DestructorCallback destructorCallback1;
DestructorCallback destructorCallback2;
destructorCallback1.EXPECT_CALLED(2); //Once for the temp1 object, once at the assignment
destructorCallback2.EXPECT_CALLED(3); //Once for the temp2 object, once in destructor of var2, once in destructor of var1
OnlyMoveableClassWithDestructorCallback temp1(&destructorCallback1);
Either<string, OnlyMoveableClassWithDestructorCallback> var1 = std::move(temp1);
OnlyMoveableClassWithDestructorCallback temp2(&destructorCallback2);
Either<string, OnlyMoveableClassWithDestructorCallback> var2 = std::move(temp2);
var1 = std::move(var2);
}