class Concurrent::FiberLocalVar

def initialize(default = nil, &default_block)

Parameters:

default_block (Proc) -- Optional block that gets called to obtain the
default (Object) -- the default value when otherwise unset

def initialize(default = nil, &default_block)
  if default && block_given?
    raise ArgumentError, "Cannot use both value and block as default value"
  end
  if block_given?
    @default_block = default_block
    @default = nil
  else
    @default_block = nil
    @default = default
  end
  @index = LOCALS.next_index(self)
end

Instance Methods