Utf8 to Utf32 cast cost

weaselcat via Digitalmars-d-learn digitalmars-d-learn at puremagic.com
Mon Jun 8 03:51:53 PDT 2015


On Monday, 8 June 2015 at 10:49:59 UTC, Ilya Yaroshenko wrote:
> On Monday, 8 June 2015 at 10:42:00 UTC, Kadir Erdem Demir 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?
>> Is there a way which I can have Utf32 string directly without 
>> a cast?
>
> 1. dstring range = to!dstring("erdem"); //without dup
> 2. dchar[] range = to!(dchar[])("erdem"); //mutable
> 3. dstring range = "erdem"d; //directly
> 4. dchar[] range = "erdem"d.dup; //mutable

what's wrong with http://dlang.org/phobos/std_utf.html#.toUTF32


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