poc-links/include/mixins/LazyLinkMixin.h

#pragma once
#include <iostream>
#include "mixins/BaseLinkMixin.h"
#include <memory>
#include "Logger.h"

/// \brief Миксин для ленивой инициализации связи (link) с дочерними элементами.
/// \tparam TLink Тип используемой связи (link).
template <class TLink>
class LazyLinkMixin : public BaseLinkMixin {
public:
	void unlinkParent() override {
		/* No link -- no parent, who'll unlinked? */
		if (!this->link_)
			throw std::logic_error("Link isn't inited!");

		BaseLinkMixin::unlinkParent();
	}

	LinkPtr getLink() override {
		lazyInit();
		return this->link_;
	}

	LazyLinkMixin() {}

	~LazyLinkMixin() override {
		Logger::get("ConDes").info("--- Destructor called for: LazyLinkMixin");
	}

protected:
	void lazyInit() {
		if (!link_) {
			link_ = std::make_shared<TLink>(
					BaseLinkMixin::getNode());
		}
	}
	LinkPtr link_;
};