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boost::proto::default_generator — A simple generator that passes an expression through unchanged.
struct default_generator : proto::callable { template<typename This, typename Expr> struct result<This(Expr)> { // types typedef Expr type; }; // public member functions template<typename Expr> Expr const & operator()(Expr const &) const; };
Generators are intended for use as the first template parameter to the
proto::domain<>
class template and control if and how expressions within that domain are to be customized.
The proto::default_generator
makes no modifications to the
expressions passed to it.