Boost C++ Libraries: Ticket #7119: [proto] implement an implicit conversion function for expressions https://svn.boost.org/trac10/ticket/7119 <p> Revive the old proto::implicit_expr functionality to allow readable expressions to be returned from functions. </p> en-us Boost C++ Libraries /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/7119 Trac 1.4.3