countsAtMost

1 static void test(R)(R x)
2     if (isInputRange!R)
3 {
4     import std.algorithm.searching : count;
5     immutable n = x.count;
6 
7     // below
8     foreach (immutable i; 0 .. n)
9     {
10         assert(x.countsAtLeast(i));
11         assert(!x.countsExactly(i));
12         assert(!x.countsAtMost(i));
13     }
14 
15     // at
16     assert(x.countsAtLeast(n));
17     assert(x.countsExactly(n));
18     assert(x.countsAtMost(n));
19 
20     // above
21     foreach (immutable i; n + 1 .. n + 10)
22     {
23         assert(!x.countsAtLeast(i));
24         assert(!x.countsExactly(i));
25         assert(x.countsAtMost(i));
26     }
27 }
28 
29 import std.algorithm.iteration : filter;
30 import std.range : iota;
31 
32 test(3.iota.filter!(x => true));
33 
34 int[3] x = [0, 1, 2];
35 test(x[]);