个人感觉使用比较方便

#define SINGLETON_CLASS_NO_DEF_CONSTRUCT_BODY(class_name)\

private:\

class_name();\

class_name(const class_name&);\

class_name & operator = (const class_name &);\

public:\

static class_name & Instance()\

{\

static class_name one;\

return one;\

}

#define SINGLETON_CLASS(class_name)\

private:\

class_name(){}\

class_name(const class_name&);\

class_name & operator = (const class_name &);\

public:\

static class_name & Instance()\

{\

static class_name one;\

return one;\

}

两个宏的区别仅在于是否实现 默认的无参构造函数。使用例子：

// HostBasicInformation.h

class HostBasicInformation

{

SINGLETON_CLASS_NO_DEF_CONSTRUCT_BODY(HostBasicInformation)

public:

virtual ~HostBasicInformation();

std::string GetInstallCode();

};

// HostBasicInformation.cpp

// 若使用SINGLETON_CLASS ，则不需要自己定义无参构造函数

HostBasicInformation::HostBasicInformation(){

}

HostBasicInformation::~HostBasicInformation(){

}

std::string HostBasicInformation::GetInstallCode()

{

return "";

}

这种宏的方式，主要优点在于：能严格限制此类的使用方式，也就是只能当做单例来使用。

std::string str_installCode = HostBasicInformation::Instance().GetInstallCode();