commit 027b560053fa176bd58273caaef7412d0d876ef6
Author: karl <karl.bittner@hexaquo.at>
Date:   Thu Nov 28 11:42:21 2019 +0100

    Basic UniquePtr functionality and tests

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..5f08175
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.15)
+project(UniquePtr)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(UniquePtr main.cpp)
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diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..8e95f1e
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,117 @@
+#include <iostream>
+
+class TestObject {
+public:
+    TestObject() {
+        std::cout << "Constructor" << std::endl;
+        instanceCount += 1;
+    }
+
+    TestObject(const TestObject &other) {
+        std::cout << "Copy constructor" << std::endl;
+    }
+
+    ~TestObject() {
+        std::cout << "Destructor" << std::endl;
+        instanceCount -= 1;
+    }
+
+    static void testPrint() {
+        std::cout << "testPrint" << std::endl;
+    }
+
+    static int getInstanceCount() {
+        return instanceCount;
+    }
+
+private:
+    static int instanceCount;
+};
+
+int TestObject::instanceCount = 0;
+
+/// Holds unique ownership of a pointed to object and destroys it automatically
+template<class T>
+class UniquePtr {
+public:
+    explicit UniquePtr(T *object) : object(object) {}
+
+    /// Copy constructor
+    /// Shouldn't be used, since the pointer wouldn't be unique otherwise
+    UniquePtr(const UniquePtr &other) = delete;
+
+    /// Move constructor
+    UniquePtr(UniquePtr &&other) : object(other.object) {
+        other.object = nullptr;
+    }
+
+    /// Copy assignment operator
+    UniquePtr &operator=(const UniquePtr &) = delete;
+
+    /// Move assignment operator
+    /// Shouldn't be used, since the pointer wouldn't be unique otherwise
+    UniquePtr &operator=(UniquePtr &&) = delete;
+
+    /// Destructor
+    virtual ~UniquePtr() {
+        delete object;
+    }
+
+    T operator*() const {
+        return *object;
+    }
+
+    operator bool() const {
+        return object != nullptr;
+    }
+
+    T *operator->() const {
+        return object;
+    }
+
+    /// Release ownership of the owned object and return the pointer to it
+    T *Release() {
+        T *returnObject = object;
+        object = nullptr;
+
+        return returnObject;
+    }
+
+    /// Reset the internal pointer to null
+    void Reset() {
+        delete object;
+
+        object = nullptr;
+    }
+
+    /// Swaps the currently owned object with another
+    void Swap(T *other) {
+        delete object;
+
+        object = other;
+    }
+
+private:
+    T *object;
+};
+
+int main() {
+    {
+        std::cout << "Constructing first pointer" << std::endl;
+        UniquePtr pointer = UniquePtr<TestObject>(new TestObject());
+
+        std::cout << "Calling test print via pointer" << std::endl;
+        pointer->testPrint();
+
+        std::cout << "Swapping for new object" << std::endl;
+        pointer.Swap(new TestObject());
+
+        std::cout << "Move constructing new pointer" << std::endl;
+        UniquePtr pointer2 = UniquePtr<TestObject>(std::move(pointer));
+    }
+
+    std::cout << std::endl << "All pointers should now be out of scope!" << std::endl;
+    std::cout << TestObject::getInstanceCount() << " instances left" << std::endl;
+
+    return 0;
+}
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