Menu
Search

Forums

Forum Index

Thread overview
Function without 'this' cannot be 'shared'
Dec 25, 2021
Ruby The Roobster
Dec 25, 2021
Adam D Ruppe
Dec 25, 2021
Ruby The Roobster
December 25, 2021
Gravatar of Ruby The RoobsterPosted by Ruby The RoobsterReply
Ruby The Roobster
Gravatar of Ruby The Roobster


Reply

Take the following code:

void main() //Can be empty, problem occurs regardless
{
}

int test(int a) //Test function.
{
   return 3 * a;
}
//Now overload it for shared...
int test(shared int a) shared
{
    return cast(shared(int))test(cast(int)a); //Note:  The problem still happens regardless whether you have this line or not.
}

Compiling on the latest version, the compiler output you get should be(assuming the file is named test.d):

Error:  function 'test.test' without 'this' cannot be 'shared'
December 25, 2021
Gravatar of Adam D RuppePosted by Adam D Ruppe
in reply to Ruby The Roobster		Reply
Adam D Ruppe
Gravatar of Adam D Ruppe
Posted in reply to Ruby The Roobster


Reply
On Saturday, 25 December 2021 at 19:46:20 UTC, Ruby The Roobster wrote:
> int test(shared int a) shared

What do you expect that second shared to do?

Generally qualifiers after the parenthesis apply to the hidden `this` parameter, and since there isn't one that's why it is failing.

If you wanted it to apply to the return value, you write that

shared(int) test() {}

and if you wanted something else, well it depends on what you wanted.
December 25, 2021
Gravatar of Ruby The RoobsterPosted by Ruby The Roobster
in reply to Adam D Ruppe		Reply
Ruby The Roobster
Gravatar of Ruby The Roobster
Posted in reply to Adam D Ruppe


Reply
On Saturday, 25 December 2021 at 20:03:49 UTC, Adam D Ruppe wrote:
> On Saturday, 25 December 2021 at 19:46:20 UTC, Ruby The Roobster wrote:
>> int test(shared int a) shared
>
> What do you expect that second shared to do?
>
> Generally qualifiers after the parenthesis apply to the hidden `this` parameter, and since there isn't one that's why it is failing.
>
> If you wanted it to apply to the return value, you write that
>
> shared(int) test() {}
>
> and if you wanted something else, well it depends on what you wanted.
Thank you.  It now works.