Am 24.12.2012 00:08, schrieb Patrick Walton:
On 12/23/12 5:53 PM, Michael Neumann wrote:
That's strange. If I use result::unwrap() it is consistently becoming
much slower! But the warning goes away. While get() is faster, but
there is this warning. Btw, there is also no .unwrap(), just
result::unwrap(). I believe that unwrap() is copying, while get() is
passing a reference somehow.
This is not what I see. This program:
fn f() -> Result<~str,~str> {
Ok(~"hello world")
}
fn main() {
for uint::range(0, 0x1234567) |_| {
let _ = f().get();
}
}
Has this performance:
real 0m15.991s
user 0m15.899s
sys 0m0.016s
While this program:
fn f() -> Result<~str,~str> {
Ok(~"hello world")
}
fn main() {
for uint::range(0, 0x1234567) |_| {
let _ = result::unwrap(f());
}
}
Has this performance:
real 0m4.318s
user 0m4.255s
sys 0m0.013s
I now see the same behaviour when I measure result::unwrap vs .get().
Hm, I think my benchmark was just flawed because it run under a VM on a
laptop.
Michael
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