It contains the basics like copy-and-swap, RAII etc. but it also contains
obscurities like Barton Nackman trick.
"More C++ idioms" is an abbreviation for "More C++ idioms than you would
think would be contained in a book on C++ idioms."
In fact, the above is what the book used to be called, but the title was
thought to be insufficiently concise.
Paul