117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
#include <iostream>
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class TestObject {
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public:
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TestObject() {
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std::cout << "Constructor" << std::endl;
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instanceCount += 1;
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}
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TestObject(const TestObject &other) {
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std::cout << "Copy constructor" << std::endl;
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}
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~TestObject() {
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std::cout << "Destructor" << std::endl;
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instanceCount -= 1;
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}
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static void testPrint() {
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std::cout << "testPrint" << std::endl;
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}
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static int getInstanceCount() {
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return instanceCount;
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}
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private:
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static int instanceCount;
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};
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int TestObject::instanceCount = 0;
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/// Holds unique ownership of a pointed to object and destroys it automatically
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template<class T>
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class UniquePtr {
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public:
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explicit UniquePtr(T *object) : object(object) {}
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/// Copy constructor
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/// Shouldn't be used, since the pointer wouldn't be unique otherwise
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UniquePtr(const UniquePtr &other) = delete;
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/// Move constructor
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UniquePtr(UniquePtr &&other) : object(other.object) {
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other.object = nullptr;
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}
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/// Copy assignment operator
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UniquePtr &operator=(const UniquePtr &) = delete;
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/// Move assignment operator
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/// Shouldn't be used, since the pointer wouldn't be unique otherwise
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UniquePtr &operator=(UniquePtr &&) = delete;
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/// Destructor
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virtual ~UniquePtr() {
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delete object;
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}
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T operator*() const {
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return *object;
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}
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operator bool() const {
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return object != nullptr;
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}
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T *operator->() const {
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return object;
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}
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/// Release ownership of the owned object and return the pointer to it
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T *Release() {
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T *returnObject = object;
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object = nullptr;
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return returnObject;
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}
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/// Reset the internal pointer to null
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void Reset() {
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delete object;
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object = nullptr;
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}
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/// Swaps the currently owned object with another
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void Swap(T *other) {
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delete object;
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object = other;
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}
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private:
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T *object;
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};
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int main() {
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{
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std::cout << "Constructing first pointer" << std::endl;
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UniquePtr pointer = UniquePtr<TestObject>(new TestObject());
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std::cout << "Calling test print via pointer" << std::endl;
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pointer->testPrint();
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std::cout << "Swapping for new object" << std::endl;
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pointer.Swap(new TestObject());
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std::cout << "Move constructing new pointer" << std::endl;
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UniquePtr pointer2 = UniquePtr<TestObject>(std::move(pointer));
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}
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std::cout << std::endl << "All pointers should now be out of scope!" << std::endl;
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std::cout << TestObject::getInstanceCount() << " instances left" << std::endl;
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return 0;
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} |