Re: [Boost-users] boost::filesystem::ifstream and .eof()

From: Frank Birbacher (bloodymir.crap_at_[hidden])
Date: 2006-08-02 18:42:50

Hi!

pktao_at_[hidden] schrieb:
>              while ( !inputDataStream.eof() ) {
> 
>                  if ( (previousIterator + 3) == i) {
> 
>                      immobileWrite(i);
> 
>                      previousIterator = previousIterator + 3;
> 
>                  }
> 
>                  else {
> 
>                      dataStructureWrite(i);
> 
>                  };
> 
>                  i++;
> 
>              };

I cannot see where data is read. Anyway:
 - first: Test for any error: "while(inputDataStream) {...}"
 - second: Test after read:
        int sum = 0, i;
        while(inputDataStream >> i) { sum +=i; }

When using istream_iterator<T>, then just test against an end interator:

std::for_each(istream_iterator<int>(inputDataStream),
istream_iterator<int>(), &foo);

All of the above is true for both boost::filesystem::basic_ifstream and
std::ifstream. It is true for any std::istream.

HTH, Frank