- std_width > 0
- std_height > 0
require
-
valid_index: i.in_range(0, count - 1)
frozen
effective function
frozen
effective function
frozen
effective function
frozen
effective function
frozen
effective function
ensure
-
good_hash_value: Result >= 0
require
ensure
- Result implies hash_code = other.hash_code
-
commutative: generating_type = other.generating_type implies Result = other.is_equal(Current)