c++字符串拷贝strcpy函数

#include "stdafx.h"
#include<iostream>
#include<string>
#include<cstring>

using namespace std;

char * strcpytemp(char *to,const char *from){
    if(to==NULL||from==NULL)
        throw "Invalid arguments";
    char *copy = to;
    while((*to++=*from++)!='\0')
        ;
    return copy;
}
int _tmain(int argc, _TCHAR* argv[])
{
    char *from = "hello";
    char *to=new char[strlen(from)+1];
    to=strcpytemp(to,from);
    cout<<to<<endl;
    cout<<strlen(to)<<endl;
    return 0;
}