C++ 智能指针：unique_ptr

深刻理解一个原理的方法之一就是去自我实现一个，上代码：

1 自定义unique_ptr

#include <iostream>
#include <utility>

template<typename T>
class unique_ptr {
private:
    T * ptr_resource = nullptr;

public:
    explicit unique_ptr(T* raw_resource) noexcept : ptr_resource(std::move(raw_resource)) {}
    unique_ptr(std::nullptr_t) : ptr_resource(nullptr) {}

    unique_ptr() noexcept : ptr_resource(nullptr) {}

    ~unique_ptr() noexcept {
        delete ptr_resource;
    }
    
    unique_ptr(const unique_ptr<T>&) noexcept = delete;
    unique_ptr& operator = (const unique_ptr&) noexcept = delete;

public:
    unique_ptr(unique_ptr&& move) noexcept {
        std::cout << "construct for unique_ptr&&" << std::endl;
        move.swap(*this);
    }
    unique_ptr& operator=(unique_ptr&& move) noexcept {
        std::cout << "operator= for unique_ptr&&" &l