PDF::Writer:PDF::QuickRef#pdf
require 'pdf/quickref' qr = PDF::QuickRef.new qr.title "My QuickRef" qr.h1 "H1 Text" qr.lines "Text to put after the header." p qr.pdf
で、
#<PDF::Writer:0x40473694 @__transaction_block__=nil, ...
何に使うのかと思ったが、「pdf = PDF::Writer.new」の pdf と同じようなものかな?