Re: How to gets multi results using tuple in D?
On Thursday, 23 December 2021 at 08:33:17 UTC, zoujiaqing wrote: C++ Code: also `...`,it's very useful.
Re: How to loop through characters of a string in D language?
On Thursday, 23 December 2021 at 16:13:49 UTC, Stanislav Blinov wrote: You're comparing apples and oranges. When benchmarking, at least look at the generated assembly first. I looked now and you're right. Insomuch that it should be eggplant not apple, banana not orange...:) Because it's an irrelevant benchmarking! Thank you all...
Re: How to loop through characters of a string in D language?
On Thursday, 23 December 2021 at 07:14:35 UTC, Salih Dincer wrote:
It seems faster than algorithms in Phobos. We would love to see
this in our new Phobos.
Replace: 436 msecs
Malloc : 259 msecs
*/
It seems because MallocReplace is cheating a lot:
- it is not called through another function like replace is
called;
- accesses directly the constant str;
- assumes that it has a single character to replace;
- assumes that the character will be deleted not replaced with
something;
- assumes that the character is always ';'
- assumes that the replacing string is not bigger than the
replaced one, so it knows exactly how much space to allocate;
- does not have any parameter, at least on x86 this means that
there is no arg pushes when it's called.
- does not return a string, just compares its result with another
constant;
Since we already know all this stuff, we can go further :)
```d
string superFast()
{
enum r = str.replace(";", "");
return r;
}
```
Replace: 436 msecs
Malloc : 259 msecs
SuperFast: 0 msecs
Re: How to loop through characters of a string in D language?
On Thursday, 23 December 2021 at 07:14:35 UTC, Salih Dincer wrote:
It seems faster than algorithms in Phobos. We would love to see
this in our new Phobos.
```d
void mallocReplace()
void normalReplace()
string result = str.replace(';',"");
}/* Console Out:
Replace: 436 msecs
Malloc : 259 msecs
*/
```
You're comparing apples and oranges. When benchmarking, at least
look at the generated assembly first.
replace is not in Phobos, it's a D runtime vestige. It's not
getting inlined even in release builds with lto, whereas that
manual version would. Also, benchmark with runtime strings, not
literals, otherwise the compiler might even swallow the thing
whole.
What you're benchmarking is, basically, inlined optimized search
in a literal versus a function call.
Re: How to gets multi results using tuple in D?
it's one of those things where D is starting to fall behind competition when it comes to quality of life features while OP's example is not that bad, the AliasSeq is plain and simple just confusing.. it's a NO also removing the need of import for tuple is needed!! it's the same with sumtype/tagged unions and enums literals we need a workgroup to tackle these issues quick some new languages are building momentum, it'll be hard to compete when they get released... we better get ready now and maintain a good balance of new features without forgetting about quality of life and deprecating/removing old features that holds us back
Re: How to gets multi results using tuple in D?
On Thursday, 23 December 2021 at 08:33:17 UTC, zoujiaqing wrote:
C++ Code:
```cpp
std::tuple DoIt()
{
return {false, 0, 0, "Hello"};
}
auto [r1, r2, r3, r4] = DoIt();
if (r1 == false)
```
D Code:
```D
Tuple!(bool, int, int, string) DoIt()
{
return [false, 1, 1, "Hello"];
}
auto result = DoIt();
auto r1= result[0];
auto r2= result[1];
auto r3= result[2];
auto r3= result[3];
if (r1 == false)
```
D requires more lines of code.
I think this is the best thing you can do:
```d
bool r1;
int r2, r3;
string r4;
AliasSeq!(r1, r2, r3, r4) = DoIt();
```
https://forum.dlang.org/thread/kmugmwmduxeoyfffo...@forum.dlang.org
How to gets multi results using tuple in D?
C++ Code:
```cpp
std::tuple DoIt()
{
return {false, 0, 0, "Hello"};
}
auto [r1, r2, r3, r4] = DoIt();
if (r1 == false)
```
D Code:
```D
Tuple!(bool, int, int, string) DoIt()
{
return [false, 1, 1, "Hello"];
}
auto result = DoIt();
auto r1= result[0];
auto r2= result[1];
auto r3= result[2];
auto r3= result[3];
if (r1 == false)
```
D requires more lines of code.
