C++动态库单例模式与exe保留同一份单例

解决方法#

1. 将单例对象初始化放入.cpp文件

示例#

Fun.h#

#ifdef FUN_EXPORTS
#define FUN_API __declspec(dllexport)
#else
#define FUN_API __declspec(dllimport)
#endif

#include <iostream>

class FUN_API Fun {
public:
	static Fun& instance();

	void showThis() {
		std::cout << this << std::endl;
	}
};

Fun.cpp#

#include "pch.h"
#include "Fun.h"

Fun& Fun::instance()
{
	static Fun fun;
	return fun;
}

测试#

#include <iostream>

#include "Fun.h"

int main()
{
    Fun::instance().showThis();
    std::cout << &Fun::instance() << std::endl;

    std::cout << "End\n";
}

结果#