On Saturday, 13 January 2018 at 00:51:51 UTC, Timon Gehr wrote:
On 13.01.2018 01:20, Mark wrote:
int (x,y) = f(1, 2); // x=3, y=-1
int (w,z) = (1, 2).f() // same as above, UFCS
int (u,v) = (1, 2).(sum, diff) // same as above, "lambda tuple"
In the last example, (sum, diff) is basically lowered to (x,y)
=> (sum(x,y), diff(x,y)).
I think this is easy enough to achieve without dedicated syntax:
import std.typecons;
template apply(F...){
auto apply(T)(T arg){
import std.conv, std.range, std.algorithm;
return
mixin(text("(",iota(F.length).map!(i=>text("F[",i,"](arg)")).join(","),")"));
}
}
void main(){
int sum(int a, int b) { return a+b; }
int diff(int a, int b) { return a-b; }
auto (u,v)=(1,2).apply!(sum, diff);
import std.stdio;
writeln(u," ",v);
}
I didn't think of that. That's cool! :)
