libcryfs/test/cpp-utils/EitherTest.cpp

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#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include <boost/optional/optional_io.hpp>
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#include "cpp-utils/either.h"
#include "cpp-utils/macros.h"
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#include <sstream>
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//TODO Go through all test cases and think about whether it makes sense to add the same test case but with primitive types.
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using std::ostringstream;
using std::string;
using std::vector;
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using std::pair;
using std::make_pair;
using namespace cpputils;
using ::testing::Test;
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class OnlyMoveable {
public:
OnlyMoveable(int value_): value(value_) {}
OnlyMoveable(OnlyMoveable &&source): value(source.value) {source.value = -1;}
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bool operator==(const OnlyMoveable &rhs) const {
return value == rhs.value;
}
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int value;
private:
DISALLOW_COPY_AND_ASSIGN(OnlyMoveable);
};
template<typename T>
struct StoreWith1ByteFlag {
T val;
char flag;
};
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class EitherTest: public Test {
public:
template<class Left, class Right>
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void EXPECT_IS_LEFT(const either<Left,Right> &val) {
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EXPECT_TRUE(val.is_left());
EXPECT_FALSE(val.is_right());
}
template<class Left, class Right>
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void EXPECT_IS_RIGHT(const either<Left,Right> &val) {
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EXPECT_FALSE(val.is_left());
EXPECT_TRUE(val.is_right());
}
template<class Left, class Right, class Expected>
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void EXPECT_LEFT_IS(const Expected &expected, either<Left, Right> &value) {
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EXPECT_IS_LEFT(value);
EXPECT_EQ(expected, value.left());
EXPECT_EQ(expected, value.left_opt().get());
EXPECT_EQ(boost::none, value.right_opt());
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const either<Left, Right> &const_value = value;
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EXPECT_EQ(expected, const_value.left());
EXPECT_EQ(expected, const_value.left_opt().get());
EXPECT_EQ(boost::none, const_value.right_opt());
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}
template<class Left, class Right, class Expected>
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void EXPECT_RIGHT_IS(const Expected &expected, either<Left, Right> &value) {
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EXPECT_IS_RIGHT(value);
EXPECT_EQ(expected, value.right());
EXPECT_EQ(expected, value.right_opt().get());
EXPECT_EQ(boost::none, value.left_opt());
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const either<Left, Right> &const_value = value;
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EXPECT_EQ(expected, const_value.right());
EXPECT_EQ(expected, const_value.right_opt().get());
EXPECT_EQ(boost::none, const_value.left_opt());
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}
};
template<typename Left, typename Right>
void TestSpaceUsage() {
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EXPECT_EQ(std::max(sizeof(StoreWith1ByteFlag<Left>), sizeof(StoreWith1ByteFlag<Right>)), sizeof(either<Left, Right>));
}
TEST_F(EitherTest, SpaceUsage) {
TestSpaceUsage<char, int>();
TestSpaceUsage<int, short>();
TestSpaceUsage<char, short>();
TestSpaceUsage<int, string>();
TestSpaceUsage<string, vector<string>>();
}
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TEST_F(EitherTest, LeftCanBeConstructed) {
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either<int, string> val = 3;
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UNUSED(val);
}
TEST_F(EitherTest, RightCanBeConstructed) {
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either<int, string> val = string("string");
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UNUSED(val);
}
TEST_F(EitherTest, IsLeft) {
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either<int, string> val = 3;
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EXPECT_IS_LEFT(val);
}
TEST_F(EitherTest, IsRight) {
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either<int, string> val = string("string");
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EXPECT_IS_RIGHT(val);
}
TEST_F(EitherTest, LeftIsStored) {
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either<int, string> val = 3;
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EXPECT_LEFT_IS(3, val);
}
TEST_F(EitherTest, RightIsStored) {
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either<int, string> val = string("string");
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EXPECT_RIGHT_IS("string", val);
}
TEST_F(EitherTest, LeftCanBeMoveContructed) {
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either<OnlyMoveable, string> val = OnlyMoveable(1);
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UNUSED(val);
}
TEST_F(EitherTest, RightCanBeMoveContructed) {
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either<string, OnlyMoveable> val = OnlyMoveable(1);
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UNUSED(val);
}
TEST_F(EitherTest, IsLeftWhenMoveContructed) {
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either<OnlyMoveable, string> val = OnlyMoveable(1);
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EXPECT_IS_LEFT(val);
}
TEST_F(EitherTest, IsRightWhenMoveContructed) {
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either<string, OnlyMoveable> val = OnlyMoveable(1);
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EXPECT_IS_RIGHT(val);
}
TEST_F(EitherTest, LeftIsStoredWhenMoveContructed) {
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either<OnlyMoveable, string> val = OnlyMoveable(2);
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EXPECT_LEFT_IS(OnlyMoveable(2), val);
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}
TEST_F(EitherTest, RightIsStoredWhenMoveContructed) {
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either<string, OnlyMoveable> val = OnlyMoveable(3);
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EXPECT_RIGHT_IS(OnlyMoveable(3), val);
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}
TEST_F(EitherTest, LeftCanBeCopied) {
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either<string, int> val = string("string");
either<string, int> val2 = val;
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EXPECT_LEFT_IS("string", val2);
}
TEST_F(EitherTest, CopyingLeftDoesntChangeSource) {
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either<string, int> val = string("string");
either<string, int> val2 = val;
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EXPECT_LEFT_IS("string", val);
}
TEST_F(EitherTest, RightCanBeCopied) {
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either<int, string> val = string("string");
either<int, string> val2 = val;
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EXPECT_RIGHT_IS("string", val2);
}
TEST_F(EitherTest, CopyingRightDoesntChangeSource) {
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either<int, string> val = string("string");
either<int, string> val2 = val;
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EXPECT_RIGHT_IS("string", val);
}
TEST_F(EitherTest, LeftCanBeMoved) {
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either<OnlyMoveable, int> val = OnlyMoveable(5);
either<OnlyMoveable, int> val2 = std::move(val);
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EXPECT_LEFT_IS(OnlyMoveable(5), val2);
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}
TEST_F(EitherTest, RightCanBeMoved) {
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either<int, OnlyMoveable> val = OnlyMoveable(5);
either<int, OnlyMoveable> val2 = std::move(val);
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EXPECT_RIGHT_IS(OnlyMoveable(5), val2);
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}
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TEST_F(EitherTest, LeftCanBeAssigned) {
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either<string, int> val = string("string");
either<string, int> val2 = string("otherstring");
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val2 = val;
EXPECT_LEFT_IS("string", val2);
}
TEST_F(EitherTest, RightCanBeAssigned) {
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either<int, string> val = string("string");
either<int, string> val2 = string("otherstring");
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val2 = val;
EXPECT_RIGHT_IS("string", val2);
}
TEST_F(EitherTest, LeftCanBeMoveAssigned) {
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either<OnlyMoveable, int> val = OnlyMoveable(3);
either<OnlyMoveable, int> val2 = OnlyMoveable(4);
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val2 = std::move(val);
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EXPECT_LEFT_IS(OnlyMoveable(3), val2);
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}
TEST_F(EitherTest, RightCanBeMoveAssigned) {
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either<int, OnlyMoveable> val = OnlyMoveable(3);
either<int, OnlyMoveable> val2 = OnlyMoveable(4);
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val2 = std::move(val);
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EXPECT_RIGHT_IS(OnlyMoveable(3), val2);
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}
TEST_F(EitherTest, LeftCanBeDirectlyAssigned) {
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either<string, int> val = string("string");
val = string("otherstring");
EXPECT_LEFT_IS("otherstring", val);
}
TEST_F(EitherTest, RightCanBeDirectlyAssigned) {
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either<int, string> val = string("string");
val = string("otherstring");
EXPECT_RIGHT_IS("otherstring", val);
}
TEST_F(EitherTest, LeftCanBeDirectlyMoveAssigned) {
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either<OnlyMoveable, int> val = OnlyMoveable(3);
val = OnlyMoveable(5);
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EXPECT_LEFT_IS(OnlyMoveable(5), val);
}
TEST_F(EitherTest, RightCanBeDirectlyMoveAssigned) {
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either<int, OnlyMoveable> val = OnlyMoveable(3);
val = OnlyMoveable(5);
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EXPECT_RIGHT_IS(OnlyMoveable(5), val);
}
TEST_F(EitherTest, ModifyLeft) {
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either<string, int> val = string("mystring1");
val.left() = "mystring2";
EXPECT_LEFT_IS("mystring2", val);
}
TEST_F(EitherTest, ModifyRight) {
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either<int, string> val = string("mystring1");
val.right() = "mystring2";
EXPECT_RIGHT_IS("mystring2", val);
}
TEST_F(EitherTest, ModifyLeftOpt) {
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either<string, int> val = string("mystring1");
val.left_opt().get() = "mystring2";
EXPECT_LEFT_IS("mystring2", val);
}
TEST_F(EitherTest, ModifyRightOpt) {
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either<int, string> val = string("mystring1");
val.right_opt().get() = "mystring2";
EXPECT_RIGHT_IS("mystring2", val);
}
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TEST_F(EitherTest, LeftEquals) {
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either<string, int> val1 = string("mystring");
either<string, int> val2 = string("mystring");
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EXPECT_TRUE(val1 == val2);
EXPECT_TRUE(val2 == val1);
EXPECT_FALSE(val1 != val2);
EXPECT_FALSE(val2 != val1);
}
TEST_F(EitherTest, LeftNotEquals) {
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either<string, int> val1 = string("mystring");
either<string, int> val2 = string("mystring2");
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EXPECT_TRUE(val1 != val2);
EXPECT_TRUE(val2 != val1);
EXPECT_FALSE(val1 == val2);
EXPECT_FALSE(val2 == val1);
}
TEST_F(EitherTest, RightEquals) {
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either<int, string> val1 = string("mystring");
either<int, string> val2 = string("mystring");
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EXPECT_TRUE(val1 == val2);
EXPECT_TRUE(val2 == val1);
EXPECT_FALSE(val1 != val2);
EXPECT_FALSE(val2 != val1);
}
TEST_F(EitherTest, RightNotEquals) {
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either<int, string> val1 = string("mystring");
either<int, string> val2 = string("mystring2");
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EXPECT_TRUE(val1 != val2);
EXPECT_TRUE(val2 != val1);
EXPECT_FALSE(val1 == val2);
EXPECT_FALSE(val2 == val1);
}
TEST_F(EitherTest, LeftNotEqualsRight) {
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either<string, int> val1 = string("mystring");
either<string, int> val2 = 3;
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EXPECT_TRUE(val1 != val2);
EXPECT_TRUE(val2 != val1);
EXPECT_FALSE(val1 == val2);
EXPECT_FALSE(val2 == val1);
}
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TEST_F(EitherTest, OutputLeft) {
ostringstream str;
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str << either<string, int>("mystring");
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EXPECT_EQ("Left(mystring)", str.str());
}
TEST_F(EitherTest, OutputRight) {
ostringstream str;
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str << either<int, string>("mystring");
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EXPECT_EQ("Right(mystring)", str.str());
}
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TEST_F(EitherTest, MakeLeft) {
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either<string, int> var = make_left<string, int>("mystring");
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EXPECT_LEFT_IS("mystring", var);
}
TEST_F(EitherTest, MakeLeft_OnlyMoveable) {
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either<OnlyMoveable, int> var = make_left<OnlyMoveable, int>(4);
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EXPECT_LEFT_IS(OnlyMoveable(4), var);
}
TEST_F(EitherTest, MakeLeft_MultiParam) {
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either<pair<int, int>, int> var = make_left<pair<int, int>, int>(4, 5);
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EXPECT_LEFT_IS(make_pair(4,5), var);
}
TEST_F(EitherTest, MakeRight) {
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either<int, string> var = make_right<int, string>("mystring");
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EXPECT_RIGHT_IS("mystring", var);
}
TEST_F(EitherTest, MakeRight_OnlyMoveable) {
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either<int, OnlyMoveable> var = make_right<int, OnlyMoveable>(4);
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EXPECT_RIGHT_IS(OnlyMoveable(4), var);
}
TEST_F(EitherTest, MakeRight_MultiParam) {
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either<int, pair<int, int>> var = make_right<int, pair<int, int>>(4, 5);
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EXPECT_RIGHT_IS(make_pair(4,5), var);
}
TEST_F(EitherTest, LeftCanBeQueriedAsRvalue) {
OnlyMoveable val = make_left<OnlyMoveable, int>(3).left();
EXPECT_EQ(OnlyMoveable(3), val);
}
TEST_F(EitherTest, RightCanBeQueriedAsRvalue) {
OnlyMoveable val = make_right<int, OnlyMoveable>(3).right();
EXPECT_EQ(OnlyMoveable(3), val);
}
TEST_F(EitherTest, LeftOptCanBeQueriedAsRvalue) {
OnlyMoveable val = make_left<OnlyMoveable, int>(3).left_opt().value();
EXPECT_EQ(OnlyMoveable(3), val);
}
TEST_F(EitherTest, RightOptCanBeQueriedAsRvalue) {
OnlyMoveable val = make_right<int, OnlyMoveable>(3).right_opt().value();
EXPECT_EQ(OnlyMoveable(3), val);
}
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class DestructorCallback {
public:
MOCK_CONST_METHOD0(call, void());
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void EXPECT_CALLED(int times = 1) {
EXPECT_CALL(*this, call()).Times(times);
}
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};
class ClassWithDestructorCallback {
public:
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ClassWithDestructorCallback(const DestructorCallback *destructorCallback) : _destructorCallback(destructorCallback) {}
ClassWithDestructorCallback(const ClassWithDestructorCallback &rhs): _destructorCallback(rhs._destructorCallback) {}
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~ClassWithDestructorCallback() {
_destructorCallback->call();
}
private:
const DestructorCallback *_destructorCallback;
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ClassWithDestructorCallback &operator=(const ClassWithDestructorCallback &rhs) = delete;
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};
class OnlyMoveableClassWithDestructorCallback {
public:
OnlyMoveableClassWithDestructorCallback(const DestructorCallback *destructorCallback) : _destructorCallback(destructorCallback) { }
OnlyMoveableClassWithDestructorCallback(OnlyMoveableClassWithDestructorCallback &&source): _destructorCallback(source._destructorCallback) {}
~OnlyMoveableClassWithDestructorCallback() {
_destructorCallback->call();
}
private:
DISALLOW_COPY_AND_ASSIGN(OnlyMoveableClassWithDestructorCallback);
const DestructorCallback *_destructorCallback;
};
class EitherTest_Destructor: public EitherTest {
};
TEST_F(EitherTest_Destructor, LeftDestructorIsCalled) {
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DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(2); //Once for the temp object, once when the either class destructs
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ClassWithDestructorCallback temp(&destructorCallback);
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either<ClassWithDestructorCallback, string> var = temp;
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}
TEST_F(EitherTest_Destructor, RightDestructorIsCalled) {
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DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(2); //Once for the temp object, once when the either class destructs
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ClassWithDestructorCallback temp(&destructorCallback);
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either<string, ClassWithDestructorCallback> var = temp;
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}
TEST_F(EitherTest_Destructor, LeftDestructorIsCalledAfterCopying) {
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DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
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ClassWithDestructorCallback temp(&destructorCallback);
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either<ClassWithDestructorCallback, string> var1 = temp;
either<ClassWithDestructorCallback, string> var2 = var1;
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}
TEST_F(EitherTest_Destructor, RightDestructorIsCalledAfterCopying) {
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DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
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ClassWithDestructorCallback temp(&destructorCallback);
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either<string, ClassWithDestructorCallback> var1 = temp;
either<string, ClassWithDestructorCallback> var2 = var1;
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}
TEST_F(EitherTest_Destructor, LeftDestructorIsCalledAfterMoving) {
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DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
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OnlyMoveableClassWithDestructorCallback temp(&destructorCallback);
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either<OnlyMoveableClassWithDestructorCallback, string> var1 = std::move(temp);
either<OnlyMoveableClassWithDestructorCallback, string> var2 = std::move(var1);
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}
TEST_F(EitherTest_Destructor, RightDestructorIsCalledAfterMoving) {
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DestructorCallback destructorCallback;
destructorCallback.EXPECT_CALLED(3); //Once for the temp object, once for var1 and once for var2
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OnlyMoveableClassWithDestructorCallback temp(&destructorCallback);
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either<string, OnlyMoveableClassWithDestructorCallback> var1 = std::move(temp);
either<string, OnlyMoveableClassWithDestructorCallback> var2 = std::move(var1);
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}
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);
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either<ClassWithDestructorCallback, string> var1 = temp1;
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ClassWithDestructorCallback temp2(&destructorCallback2);
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either<ClassWithDestructorCallback, string> var2 = temp2;
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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);
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either<string, ClassWithDestructorCallback> var1 = temp1;
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ClassWithDestructorCallback temp2(&destructorCallback2);
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either<string, ClassWithDestructorCallback> var2 = temp2;
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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);
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either<OnlyMoveableClassWithDestructorCallback, string> var1 = std::move(temp1);
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OnlyMoveableClassWithDestructorCallback temp2(&destructorCallback2);
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either<OnlyMoveableClassWithDestructorCallback, string> var2 = std::move(temp2);
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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);
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either<string, OnlyMoveableClassWithDestructorCallback> var1 = std::move(temp1);
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OnlyMoveableClassWithDestructorCallback temp2(&destructorCallback2);
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either<string, OnlyMoveableClassWithDestructorCallback> var2 = std::move(temp2);
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var1 = std::move(var2);
}