On 02/18/2012 03:20 AM, bearophile wrote:
H. S. Teoh:
P.S.S. The .idup is a bit ugly, but necessary, since apparently byLine()
calls readln() with a static buffer, so choice will be silently
overwritten if the .idup is omitted.
An alternative File API that to me looks nice. This is a first part, it's for
scripting-like or not high performance purposes, it looks essentially like
Python code, every line is a newly allocated string:
import std.stdio;
void main() {
string[] lines;
foreach (line; File("data.dat")) {
static assert(is(line == string));
lines ~= line;
}
}
If you don't want a new buffer every line you use something like this:
import std.stdio;
void main() {
string[] lines;
foreach (line; File("data.dat").fastLines()) {
static assert(is(line == char[]));
lines ~= line.idup;
}
}
So on default it's handy, short and safe, and with a method you avoid an
allocation every line and get a mutable char[].
Maybe even this works, downloads a page and scans its lines, but maybe it's
better to add a bit of extra safety to this:
foreach (line; File("http://www.dlang.org/faq.html";)) {}
Bye,
bearophile
Note that what we have now is clear, handy, quite short and safe and
efficient. What you propose takes away the clarity and efficiency parts.
foreach(foo; File("data.dat")) {} // by what does this iterate?
