import std.stdio, std.traits;

​

bool isSorted(alias less = "a < b", Range)(Range r)

{

    import std.algorithm : isSortedImpl = isSorted;

​

    static if (isStaticArray!Range)

    {

        return isSortedImpl!less(r[]);

    }

    else

    {

        return isSortedImpl!less(r[]);

    }

}

​

void main()

{

    [0, 1, 2, 3, 4].isSorted.writeln;

    static immutable arr = [0, 1, 2, 3, 4];

    arr.isSorted;

​

}