Post about comparing C, C++ and D performance with a real world project
helxi
brucewayneshit at gmail.com
Sat Dec 9 13:36:54 UTC 2017
On Friday, 8 December 2017 at 15:40:08 UTC, Steven Schveighoffer
wrote:
> On 12/7/17 8:11 PM, Mengu wrote:
>> On Thursday, 7 December 2017 at 22:39:44 UTC, Daniel Kozak
>> wrote:
>>> The other slowdown is caused by concatenation. Because
>>> std::string += is more simillar to std.array.(Ref)Appender
>>
>> wait, i thought appenders performed better than concatenation.
>> is that not true or did i just misunderstand your post?
>>
>
> You misunderstood. Appender is faster than ~= to a straight
> array, because it doesn't have to do any opaque lookups in the
> GC to see if it needs to reallocate -- all the information is
> right there.
>
> Daniel's point was that Appender is more akin to std::string
> (which doesn't have the benefit of having language-defined
> array operaions). If the blogger used Appender, he would have
> had better performance.
>
> -Steve
As a new comer, I find these very educational. I wish there was a
documentation or a book to warn D learners about these pitfalls.
"Effective D" when? :D
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