Most performant way of converting int to string
Andrew Chapman via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Tue Dec 22 09:23:11 PST 2015
On Tuesday, 22 December 2015 at 17:18:16 UTC, cym13 wrote:
> On Tuesday, 22 December 2015 at 17:15:27 UTC, Andrew Chapman
> wrote:
>> Sorry if this is a silly question but is the to! method from
>> the conv library the most efficient way of converting an
>> integer value to a string?
>>
>> e.g.
>> string s = to!string(100);
>>
>> I'm seeing a pretty dramatic slow down in my code when I use a
>> conversion like this (when looped over 10 million iterations
>> for benchmarking).
>>
>> Cheers!
>
> Out of curiosity a slow down compared to what? No conversion at
> all?
Yeah, if I include a simple conversion in my loop:
for({int i; i = 0;} i < num; i++) {
//string s = to!string(i);
Customer c = Customer(i, "Customer", "99998888",
i * 2);
string result = objS.serialize(c);
}
If I uncomment the "string s" line I'm seeing a 20% increase in
running time, which given what's going on the rest of the code is
quite surprising. I've tried compiling with both dmd and ldc2 -
it's the same under both.
Cheers.
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