Counter

Counter!char counter;
counter.put("Ми");
assert(counter.count == 4);
counter.put('р'); // Cyrillic 
assert(counter.count == 6);

Counter!wchar counter;
counter.put("Ми");
assert(counter.count == 2);
counter.put('р'); // Cyrillic
assert(counter.count == 3);

Counter!int counter;
import std.algorithm: until;
counter.put([1, 2, 3, 4, 5].until(3));