#include <iostream>
using namespace std;
class CA
{
public:
CA():m_a(100){}
int m_a;
};
int main()
{
CA* obj = new CA;
obj->m_a = 1;
new( obj ) CA ;
cout<<obj->m_a;
}
输出100
#include <iostream>
using namespace std;
class CA
{
public:
CA():m_a(100){}
int m_a;
};
int main()
{
CA* obj = new CA;
obj->m_a = 1;
new( obj ) CA ;
cout<<obj->m_a;
}
输出100