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# The global value `true` is the only instance of class TrueClass and represents
# a logically true value in boolean expressions. The class provides operators
# allowing `true` to be used in logical expressions.
#
class TrueClass
  public

  def !: () -> bool

  # And---Returns `false` if *obj* is `nil` or `false`, `true` otherwise.
  #
  def &: (nil) -> false
       | (false) -> false
       | (untyped obj) -> bool

  # Case Equality -- For class Object, effectively the same as calling `#==`, but
  # typically overridden by descendants to provide meaningful semantics in `case`
  # statements.
  #
  def ===: (true) -> true
         | (untyped obj) -> bool

  # Exclusive Or---Returns `true` if *obj* is `nil` or `false`, `false` otherwise.
  #
  def ^: (nil) -> true
       | (false) -> true
       | (untyped obj) -> bool

  alias inspect to_s

  # The string representation of `true` is "true".
  #
  def to_s: () -> "true"

  # Or---Returns `true`. As *obj* is an argument to a method call, it is always
  # evaluated; there is no short-circuit evaluation in this case.
  #
  #     true |  puts("or")
  #     true || puts("logical or")
  #
  # *produces:*
  #
  #     or
  #
  def |: (boolish obj) -> bool
end