#include <iostream>
using namespace std;
class Element
{
public:
Element(int e = 12) : elem(e)
{
cout << "element 1" << endl;
}
int elem;
};
class ArrayHelper
{
public:
ArrayHelper()
{
cout<< "cons 1" << endl;
}
ArrayHelper(int size) : val(size)
{
cout<< "cons 2" << endl;
}
ArrayHelper(const ArrayHelper &other)
{
cout<< "cons 3" << endl;
val = other.val;
}
ArrayHelper &operator=(const ArrayHelper &other)
{
cout<< "cons 4" << endl;
val = other.val;
s = other.s;
return *this;
}
public:
int val;
Element s;
};
int main()
{
ArrayHelper x;
ArrayHelper m(12);
ArrayHelper v = m;
v = m;
cout<< v.val << endl;
}
另存为test_constructor.cpp，用g++编译运行，结果为：
element 1 cons 1 element 1 cons 2 element 1 cons 3 cons 4 12
