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最新推荐文章于 2025-04-24 13:26:54 发布

rayyy9

最新推荐文章于 2025-04-24 13:26:54 发布

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分类专栏： cereal 文章标签： c++

本文链接：https://blog.youkuaiyun.com/reyyy/article/details/143176087

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错误代码

class HybridEngine {

public:
	int a = 1;

	template <class Archive>
	void serialize(Archive & ar, uint32_t const version)
	{
		ar(a);
	}
};

void test7() {

	HybridEngine g, h;
	std::shared_ptr<HybridEngine> gp = std::make_shared<HybridEngine>(g);
	std::shared_ptr<HybridEngine> hp = nullptr;
	gp->a = 2;
	//hp->a = 5;

	std::ofstream ofs("./test7.xar", std::ios::binary);
	if (!ofs.is_open()) {
		std::cerr << "Error: Failed to save " ;
	}
	cereal::BinaryOutputArchive oar(ofs);
	oar(gp);
    if (hp)
	    oar(hp);
	ofs.close();

	std::ifstream ifs("./test7.xar", std::ios::binary);
	cereal::BinaryInputArchive iar(ifs);
	iar(gp);
	iar(hp);
	ifs.close();

	if (hp)
		std::cout << "hp is not nullptr" << std::endl;;
	
	std::cout << gp->a << std::endl;
	//std::cout << hp->a << std::endl;

}

以上代码，hp是空指针，没有保存，再读取的时候，会崩

正确代码

class HybridEngine {

public:
	int a = 1;

	template <class Archive>
	void serialize(Archive & ar, uint32_t const version)
	{
		ar(a);
	}
};

void test7() {

	HybridEngine g, h;
	std::shared_ptr<HybridEngine> gp = std::make_shared<HybridEngine>(g);
	std::shared_ptr<HybridEngine> hp = nullptr;
	gp->a = 2;
	//hp->a = 5;

	std::ofstream ofs("./test7.xar", std::ios::binary);
	if (!ofs.is_open()) {
		std::cerr << "Error: Failed to save " ;
	}
	cereal::BinaryOutputArchive oar(ofs);
	oar(gp);
	oar(hp);
	ofs.close();

	std::ifstream ifs("./test7.xar", std::ios::binary);
	cereal::BinaryInputArchive iar(ifs);
	iar(gp);
	iar(hp);
	ifs.close();

	if (hp)
		std::cout << "hp is not nullptr" << std::endl;;
	
	std::cout << gp->a << std::endl;
	//std::cout << hp->a << std::endl;

}