boost::thread 使用函数对象来构造线程对象的问题

#include<boost/thread/thread.hpp>
#include<iostream>
usingnamespacestd;
usingnamespaceboost;

/**
*@briefMethod2:Usethefuntionobjectconstructthreadobject.
*/

classFuncObject
{
public:
FuncObject(intarg):m_arg(arg)
{
cout<<"Construct."<<endl;
};

FuncObject(FuncObject&the)
{
this->m_arg=the.m_arg;
cout<<"Copyconstruct."<<endl;
}

~FuncObject()
{
cout<<"Disconstruct"<<endl;
}

voidoperator()()
{
//这里将是线程的运行体...
}

intGetArg()
{
returnm_arg;
}

private:

intm_arg;
};

intmain()
{
intb=10;
FuncObjecta(b);

threadth(a);///<Waring:Theobjectwillbecopied.Oh,Ithas4times!

th.join();///<waitingforthethreadover.

return0;
}

在vs2008运行的结果：

构造函数调用一次，拷贝函数调用了四次，析构函数调用了五次.

这时我作的拷贝函数要轻量级，才能体现出boost::thread效率.