namespace与访问限定符

#include <iostream>usingnamespacestd;
namespacemyspace{
classPerson    {
public:
intget_age(void)
        {
returnm_age;
        }
voidset_age(intage)
        {
m_age=age+2;
        }
private:
intm_age{0};
    };
}
classPerson{
public:
intget_age(void)
    {
returnm_age;
    }
voidset_age(intage)
    {
m_age=age+2;
    }
private:
intm_age{0};
};
intmain()
{
Personperson1; // 默认是全局的person1    ::Personperson2; // 显示指出person2是全局空间下的myspace::Personperson3; // 显示指出person3是myspace空间下的return0;
}