On Monday, 26 February 2018 at 16:53:39 UTC, drug wrote:
you can do something like this (https://run.dlang.io/is/RYR5Dm):
```
import std.algorithm : sum;
import std.range : only;
import std.stdio : writeln;
import std.typecons : tuple;
void main()
{
{
auto list = tuple(1, 2.4, 5);
auto sum = list.expand.only.sum;
writeln(sum);
}
{
// do not compile
/*
auto list = tuple(1, 2.4, 5, "123");
auto sum = list.expand.only.sum;
writeln(sum);
*/
}
}
```
This looks good. It's not completely transparent, because of this
"expand.only" thing. But I guess it can be done to hide it.
Thanks for this one.