Re: STL: Could you make this snippet more efficient
"Victor Bazarov" <v.Abazarov@comAcast.net> wrote:
Daniel T. wrote:
[..]
set< unsigned int > modpckset; // has to be defined outside the loop
string line;
while ( getline( fp, line ) ) // proper way to read until end of file
{
istringstream ss( line );
copy( istream_iterator< unsigned int >( ss ),
istream_iterator< unsigned int >(),
inserter( modpckset, modpckset.begin() ) );
}
With the above code, getline will read in a line of the file at a
time, then parse it out to a bunch of unsigned ints. We don't need to
do the extra step:
set< unsigned int > modpckset;
copy( istream_iterator< unsigned int >( fp ),
istream_iterator< unsigned int >(),
inserter( modpckset, modpckset.begin() ) );
The above will do the same thing.
Really? Will it? What if it can't copy (there is 'O' instead of '0'
somewhere in the file)? Will it attempt to read again from the next
line?
Sorry, at some point while writing the post, I had written that I was
assuming that the file contained all unsigned ints. I must have
accidentally cut that line out.
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