On Sunday, 11 August 2019 at 16:11:15 UTC, DanielG wrote:
int[][] whatever = [
[0],
[0, 1, 2],
[5, 6, 7, 8, 9, 10]
];
writeln(whatever[2]); // [5, 6, 7, 8, 9, 10]
writeln(typeid(whatever[2])); // int[]
auto x = whatever[2].filter(x => x > 7); // error
Error: template std.algorithm.iteration.filter cannot deduce
function from argument types !()(int[], void), candidates are:
...
Online example:
https://run.dlang.io/is/LUXFuF
...
I'm guessing I need to give the compiler some help
understanding that this is an array of ints, but 1) how, and 2)
why? [if typeid() seems to understand just fine?]
You're missing an exclamation mark after filter - it takes the
predicate as a template argument. This compiles just fine:
auto x = whatever[2].filter!(x => x > 7);
--
Simen
