On Mon, Feb 16, 2009 at 6:54 PM, Zack Weinberg <[email protected]> wrote:
> As far as I can tell, this is the most efficient way in standard C++
> to write the entire contents of a string to a file:
>
> std::copy(data.begin(), data.end(), ostreambuf_iterator<char>(&fout));
It occurs to me shortly after hitting send that this is rather more
verbose and probably no faster than
fout << data;
where fout is now an ofstream. And I know how to detect I/O errors
with an actual ofstream. I wrote it this way because in a different
function in the same file there's this:
filebuf fin;
if (!fin.open(fname, ios::in))
return false;
result.clear();
copy(istreambuf_iterator<char>(&fin), istreambuf_iterator<char>(),
back_inserter(result));
which *really is* the most efficient way to copy the entire contents
of a file *into* a std::string as far as I know. Only I don' t know
how to detect I/O errors on *that*, either.
So I'm really requesting enlightenment as to (a) how to detect I/O
errors with filebufs and [io]streambuf_iterators generally, (b) the
real true actual most efficient way to copy the entire contents of a
file into a string, and back out again.
zw
_______________________________________________
Monotone-devel mailing list
[email protected]
http://lists.nongnu.org/mailman/listinfo/monotone-devel
