void copy(const char *src, const char *dst) {
std::cout << "copying " << src << " to " << dst << std::endl;
Mmap<char> mmap;
CHECK_DIE(mmap.open(src)) << mmap.what();
std::ofstream ofs(dst, std::ios::binary|std::ios::out);
CHECK_DIE(ofs) << "permission denied: " << dst;
ofs.write(reinterpret_cast<char*>(mmap.begin()), mmap.size());
ofs.close();
}
//---------------------------------
int main(){
ifstream in("abc.txt");
vector<string> abc;
// abc.reserve(1100);
Mmap nums;
int n=0;
for(string s; getline(in,s); ){
istringstream sin(s);
int num=0;
for(string t; sin>>t; num++);
if(num){
nums.insert(Mmap::value_type(num, n++));
abc.push_back(s);
}
}
for(Mmap::iterator it=nums.begin(); it!=nums.end(); ++it)
cout<<abc[it->second]<<endl;
getchar();
}//=================================