Ruby 1.9.3 リファレンスマニュアル > ライブラリ一覧 > 組み込みライブラリ > ARGFオブジェクト > closed?

singleton method ARGF.closed?

closed? -> bool

ARGFがcloseされていればtrueを返します。

# カレントディレクトリから適当にファイルを選ぶ
ARGV.replace(
  Dir.glob("*").reject{|name| FileTest.file?(name) == false}
)
ARGF.each {|line|
  p [ line.chomp, ARGF.filename ]
  ARGF.close
  if ARGF.closed?
    p "ARGF is closed."
  else
    p "ARGF is not closed"
  end
}
if ARGF.closed?
  p "ARGF had been closed."
else
  p "ARGF is not closed"
end

#例
#=> ["cat:", "sample.yaml"]
#=> "ARGF is not closed"
#=> ["", "test.rb"]
#=> "ARGF is not closed"
#=> ["--- !ruby/object:Dog ", "ugo.yaml"]
#=> "ARGF is closed."
#=> "ARGF had been closed."

[SEE_ALSO] IO#closed?