Utf8 to Utf32 cast cost
Daniel Kozák via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Mon Jun 8 03:59:31 PDT 2015
On Mon, 08 Jun 2015 10:41:59 +0000
Kadir Erdem Demir via Digitalmars-d-learn
<digitalmars-d-learn at puremagic.com> wrote:
> I want to use my char array with awesome, cool std.algorithm
> functions. Since many of this algorithms requires like slicing
> etc.. I prefer to create my string with Utf32 chars. But by
> default all strings literals are Utf8 for performance.
>
> With my current knowledge I use to!dhar to convert Utf8[](or
> char[]) to Utf32[](or dchar[])
>
> dchar[] range = to!dchar("erdem".dup)
>
> How costly is this?
import std.conv;
import std.utf;
import std.datetime;
import std.stdio;
void f0() {
string somestr = "some not so long utf8 string forbenchmarking";
dstring str = to!dstring(somestr);
}
void f1() {
string somestr = "some not so long utf8 string forbenchmarking";
dstring str = toUTF32(somestr);
}
void main() {
auto r = benchmark!(f0,f1)(1_000_000);
auto f0Result = to!Duration(r[0]);
auto f1Result = to!Duration(r[1]);
writeln("f0 time: ",f0Result);
writeln("f1 time: ",f1Result);
}
/// output ///
f0 time: 2 secs, 281 ms, 933 μs, and 8 hnsecs
f1 time: 600 ms, 979 μs, and 8 hnsecs
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