...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::functional::pop_front — A PolymorphicFunctionObject type that invokes the
fusion::pop_front()
algorithm on its argument.
// In header: <boost/proto/functional/fusion/pop_front.hpp> struct pop_front : proto::callable { // member classes/structs/unions template<typename This, typename Seq> struct result<This(Seq)> : result< This(Seq const &) > { }; template<typename This, typename Seq> struct result<This(Seq &)> : fusion::result_of::pop_front< Seq > { }; // public member functions template<typename Seq> typename fusion::result_of::pop_front< Seq >::type operator()(Seq &) const; template<typename Seq> typename fusion::result_of::pop_front< Seq const >::type operator()(Seq const &) const; };
A PolymorphicFunctionObject type that invokes the
fusion::pop_front()
algorithm on its argument. This is
useful for defining a CallableTransform such as
pop_front(_)
, which removes the first child from a Proto
expression node. Such a transform might be used as the first argument to the
proto::fold<>
transform; that is, fold all but the first child.