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boost::proto::context::callable_eval — A BinaryFunction that accepts a Proto expression and a callable context and calls the context with the expression tag and children as arguments, effectively fanning the expression out.
// In header: <boost/proto/context/callable.hpp> template<typename Expr, typename Context> struct callable_eval { // types typedef typename boost::result_of< Context( typename Expr::proto_tag, typename proto::result_of::child_c<0>::type, ... typename proto::result_of::child_c<N>::type, )>::type result_type; // public member functions result_type operator()(Expr &, Context &) const; };
              proto::context::callable_eval<> requires that
              Context is a PolymorphicFunctionObject
              that can be invoked with Expr's tag and children as
              expressions, as follows:
              
context(typename Expr::proto_tag(), proto::child_c<0>(expr), ... proto::child_c<N>(expr))
callable_eval public member functionsresult_type operator()(Expr & expr, Context & context) const;
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