Class: Hyperion::Util

Inherits:
Object
  • Object
show all
Defined in:
lib/hyperion/aux/util.rb

Defined Under Namespace

Classes: CallCcError

Class Method Summary collapse

Class Method Details

.callcc ⇒ Object

reimplement callcc because ruby has deprecated it



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# File 'lib/hyperion/aux/util.rb', line 19

def self.callcc()
  in_scope = true
  cont = proc do |retval|
    unless in_scope
      raise "Cannot invoke this continuation. Control has left this continuation's scope."
    end
    raise CallCcError.new(retval)
  end
  yield(cont)
rescue CallCcError => e
  e.retval
ensure
  in_scope = false
end

.guard_param(value, what, expected_type = nil, &pred) ⇒ Object 



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# File 'lib/hyperion/aux/util.rb', line 13

def self.guard_param(value, what, expected_type=nil, &pred)
  pred ||= proc { |x| x.is_a?(expected_type) }
  pred.call(value) or fail BugError, "You passed me #{value.inspect}, which is not #{what}"
end

.nil_if_error ⇒ Object 



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# File 'lib/hyperion/aux/util.rb', line 5

def self.nil_if_error
  begin
    yield
  rescue StandardError
    return nil
  end
end