...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::proto::pre_dec — A metafunction for generating pre-decrement expression types,
a grammar element for matching pre-decrement expressions, and
a PrimitiveTransform that dispatches to the
proto::pass_through<>
transform.
// In header: <boost/proto/traits.hpp> template<typename T> struct pre_dec : proto::transform< pre_dec<T> > { // types typedef proto::expr< proto::tag::pre_dec, proto::list1< T > > type; typedef proto::basic_expr< proto::tag::pre_dec, proto::list1< T > > proto_grammar; // member classes/structs/unions template<typename Expr, typename State, typename Data> struct impl : proto::pass_through<pre_dec>::template impl<Expr, State, Data> { }; };