Hash::MutableWrapper(K, V)

Wraps a Hash object. The including type will behave as a hash, where objects returned by methods will be wrapped as well if the return type is the same as the original hash.

class Table
  include HashWrapper::Mutable(String, Int32)
end

table = Table.new {"a" => 1, "b" => 2}
table["a"]? # => 1
table["b"]? # => 2
table["c"]? # => nil
table["c"] = 3
table.select { |_, v| v > 2 } # => Table{"b" => 2}

table["a"] = -1
table["c"] = 3
table["a"]? # => -1
table["c"]? # => 3

table.select!("a")
table.keys # => ["a"]