properly passing strings to functions? (C++ vs D)

[Ola Fosheim Grøstad]

On Monday, 11 January 2021 at 15:23:23 UTC, Ola Fosheim Grøstad 
wrote:
> On Monday, 11 January 2021 at 14:12:57 UTC, zack wrote:
>> A beginner question: How to pass strings properly to functions 
>> in D?
>> Is there any allocation going on if just use a function as 
>> "myPrint"? In C++ I have often seen calls where one just 
>> passes a reference/const reference to a string to avoid 
>> allocation.
>
> C++ strings are reference counted, I think, so it is more to 
> avoid a reference count increment than to avoid a collection.

I meant allocation... The following prints "1", so no allocation.

#include <iostream>
#include <string>

std::string a("hello world");

void f(std::string b){
     std::cout << (b.data() == a.data()) << std::endl;
}

int main()
{
     f(a);
}