这个程序在编译的时候总是出现 abormal program termination 这是什么原因啊？谢谢
#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
#include<map>

using namespace std;
ifstream & open_file(ifstream & in,const string & file);
int main(int argc,char * argv[])
{
    map<string,string> trans_map;
    string key ,value;
    if(argc!=3)
        throw runtime_error("wrong number of arguments");
    ifstream map_file;
    if(!open_file(map_file,argv[1]))
        throw runtime_error("no transformation file");
    while(map_file>>key>>value)
        trans_map.insert(make_pair(key,value));
    ifstream input;
    if(!open_file(input,argv[2]))
        throw runtime_error("no input file");
    string line;
while(getline(input,line))
    {
        istringstream stream(line);
        string word;
        bool firstword=true;
        while(stream>>word)
        {
            map<string,string>::const_iterator map_it=trans_map.find(word);
            if(map_it!=trans_map.end())
                word=map_it->second;
            if(firstword)
                firstword=false;
            else 
                cout<<" ";
            cout<<word;
        }
        cout<<endl;
    }
    return 0;
}
ifstream & open_file(ifstream & in,const string & file)
{
    in.close();
    in.clear();
    in.open(file.c_str());
    return in;
}