On 2021-05-27 13:11, sighoya wrote:
On Thursday, 27 May 2021 at 09:58:40 UTC, Christian Köstlin wrote:
I have this small program here
test.d:
```
import std;
string doSomething(string[] servers, string user) {
return user ~ servers[0];
}
void main() {
auto servers = ["s1", "s2", "s3"];
auto users = ["u1", "u2", "u3"];
writeln(map!(user => servers.doSomething(user))(users));
writeln(taskPool.amap!(user => servers.doSomething(user))(users));
}
```
I think it relates to https://issues.dlang.org/show_bug.cgi?id=5710
The reason is that amap requires a this pointer of type TaskPool and a
context pointer to the closure which belongs to main, at least because
it requires servers. Having both isn't possible due to problems in non
DMD compilers.
If you rewrite it more statically:
```D
string doSomething(string[] servers, string user) {
return user ~ servers[0];
}
string closure(string user)
{
return servers.doSomething(user);
}
auto servers = ["s1", "s2", "s3"];
int main()
{
auto users = ["u1", "u2", "u3"];
writeln(map!(user => servers.doSomething(user))(users));
writeln(taskPool.amap!(closure)(users));
return 0;
}
```
PS: Just enable markdown if you want to highlight D code
On a second not I needed to make server __gshared in my real program, as
otherwise its a thread local variable (in the small demo program, this
did not occur, I guess because the parallel operations we're too fast).
Kind regards,
Christian
