On Saturday, 30 August 2025 at 11:43:27 UTC, Brother Bill wrote:
I tried various code changes, none of which worked.
Kindly provide code changes to fix warnings that reflect modern
D programming.
This worked for me:
```d
import std.stdio;
import std.concurrency;
import std.conv;
struct CalculationFailure
{
string reason;
}
struct Exit
{
}
void calculate()
{
bool isDone = false;
while (!isDone)
{
receive((string message) {
try
{
ownerTid.send(to!double(message) + 0.5);
}
catch (Exception exc)
{
ownerTid.send(cast(shared)exc); // cast to shared
to get it into the message queue.
}
},
(Exit message) { isDone = true; });
}
}
void main()
{
Tid calculator = spawn(&calculate);
calculator.send("1.2");
calculator.send("hello"); // ← incorrect input
calculator.send("3.4");
calculator.send(Exit());
foreach (i; 0 .. 3)
{
writef("result %s: ", i);
receive(
(double message) { writeln(message); },
(shared Exception message) {
throw cast()message; // cast away from shared to
actually throw it.
});
}
}
```
