BoostBook element template-varargs
template-varargs — Declares a variable-length list of template parameters
 
Synopsis
template-varargs ::= 
  EMPTY
Description
Variable-length template parameter lists are not allowed in
  C++, but because they are sometimes needed in documentation they are
  allowed in BoostBook. This element generally expands to "..." and
  can be used anywhere any other template parameter can be
  used.