#include<iostream>
#include<fstream>
using namespace std;
void process(string filename)
{
fstream file(filename);
file << "Hallo world!" << endl;
file.close();
}
int main()
{
#include"haha.txt"
string s = "haha.txt";
process(s);
return 0;
}
原文：http://www.cnblogs.com/KennyRom/p/5852408.html