C中的深拷贝和浅拷贝

深拷贝和浅拷贝多出现于结构体中的指针中的。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct Teacher{
	char name[64];
	int age;
	char *pname;
}Teacher;

//编译器的=号操作，只会把变量的值 拷贝过去 从from拷贝到to
//但不会执行内存空间的拷贝 
//浅拷贝是结构体中套指针
//那如果想执行深拷贝 
void copyTeacher(Teacher *to,Teacher *from){
	*to = *from;
	
	to->pname = (char *)malloc(100);
	strcpy(to->pname,from->pname); //深拷贝 
	//memcpy(to,from,sizeof(Teacher));
}
int main(){
	Teacher t1;
	Teacher t2;
	strcpy(t1.name,"name1");
	t1.pname = (char*)malloc(100);
	strcpy(t1.pname,"name2");
	//t1 copyto t2
	copyTeacher(&t2,&t1);
	if(t1.pname!= NULL){
		free(t1.pname);
		t1.pname = NULL;
	}
	if(t2.pname!=NULL){
		free(t2.pname);
		t2.pname = NULL;
	}
	return 0;	
}