On Saturday, 23 August 2025 at 13:42:52 UTC, Nick Treleaven wrote:
On Saturday, 23 August 2025 at 13:38:27 UTC, Nick Treleaven
wrote:
I'm not aware of any template function called `caller` -
perhaps it is defined in the book somewhere?
```d
void caller(alias func)() {
write("calling: ");
func();
}
```
https://dlang.org/book/templates_more.html#ix_More%20Templates.alias,%20template%20parameter
That is the missing piece.
app/source.d
```
import std.stdio;
void main() {
auto o = new C();
caller!o();
caller!({ writeln("Function literal called."); })();
}
class C {
void opCall() {
writeln("C.opCall called.");
}
}
void caller(alias func)() {
write("calling: ");
func();
}
```
Running produces: (matching the book)
```
calling: C.opCall called.
calling: Function literal called.
```
