对一个类指针成员应有四大函数 的简单程序

[c++]代码库

#include <iostream>
#include <string>
#include <vector>
using namespace std;
class obj
{
public:
	obj()
	{
		m_data = new char[256];
		printf("obj constructed\n");
	}
	obj(const obj &other)
	{
		size_t length = strlen(other.m_data);
		m_data = new char[length + 1];
		Strcpy(m_data,other.m_data);
	}
	obj & operator = (const obj &other)
	{
		if (this == &other)
			return *this;
		delete []m_data;
		size_t length = strlen(other.m_data);
		m_data = new char[length + 1];
		Strcpy(m_data,other.m_data);
		return *this;
	}
	~obj()
	{
		delete []m_data;
	}
private:
	char* m_data;
};
int main()
{
	vector<obj> oo;
	obj o;
	oo.push_back(o);//在此处调用拷贝构造函数	
	return 0;
}