C++ unique_ptr 직접 구현해 보기

#include <cstdio>
#include <cstddef>
#include <utility>

template <typename T>
struct SimpleUniquePointer {
    SimpleUniquePointer() = default;
    SimpleUniquePointer(T* pointer) : pointer{ pointer } { }
    ~SimpleUniquePointer() {
        if(pointer) delete pointer;
    }
    SimpleUniquePointer(const SimpleUniquePointer&) = delete;
    SimpleUniquePointer& operator=(const SimpleUniquePointer&) = delete;
    SimpleUniquePointer(SimpleUniquePointer&& other) noexcept
    : pointer{ other.pointer } {
        other.pointer = nullptr;
    }
    SimpleUniquePointer& operator=(SimpleUniquePointer&& other) noexcept {
        if(pointer) delete pointer;
        pointer = other.pointer;
        other.pointer = nullptr;
        return *this;
    }
    T* get() {
        return pointer;
    }
private:
    T* pointer;
};

struct Tracer {
    Tracer(const char* name) : name{ name } {
        printf("%s constructed.\n", name);
    }
    ~Tracer() {
        printf("%s destructed.\n", name);
    }
private:
    const char* const name;
};

void consumer(SimpleUniquePointer<Tracer> consumer_ptr) {
    printf("(cons) consumer_ptr: 0x%p\n", consumer_ptr.get());
}

int main() {
    auto ptr_a = SimpleUniquePointer<Tracer>(new Tracer{"ptr_a"});
    printf("(main) ptr_a: 0x%p\n", ptr_a.get());
    consumer(std::move(ptr_a));
    printf("(main) ptr_a: 0x%p\n", ptr_a.get());
}

/*
ptr_a constructed.
(main) ptr_a: 0x0x55bbbf073e70
(cons) consumer_ptr: 0x0x55bbbf073e70
ptr_a destructed.
(main) ptr_a: 0x(nil)
*/