C++输入输出流迭代器 map

//text1.txt
'em		them
cuz		because
gratz	grateful
i		I
nah		no
pos		supposed
sez		said
tanx	thanks
wuz		was

//text2.txt
nah i sez tanx cuz i wuz pos to
not cuz i wuz gratz

//text3.txt
no I said thanks because I was supposed to
not because I was grateful

#include<iostream>
#include<map>
#include<string>
#include<fstream>
#include<sstream>
#include<iterator>
using namespace std;
int main()
{
map<string,string> m;
string str,str1,str2,s;
ifstream inTextOne("text1.txt");
while(getline(inTextOne,str))
{
inTextOne>>str1>>str2;
m[str1]=str2;
}
inTextOne.close();
ifstream inTextTwo("text2.txt");
ofstream outText("text3.txt");
while(getline(inTextTwo,str))
{
map<string,string>::iterator it;
bool trueFirst=false;
istringstream sin(str);
istream_iterator<string> begin(sin);
istream_iterator<string> end;
ostream_iterator<string> out(outText);
while(begin!=end)
{
if(trueFirst) *out++=" ";
trueFirst=true;
it=m.find(*begin);
if(it!=m.end()) *out++=it->second;
else *out++=*begin;
begin++;
}
*out++="/n";
}
inTextTwo.close();
outText.close();
return 0;
}