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boost::proto::context::null_eval
// In header: <boost/proto/context/null.hpp> template<typename Expr, typename Context> struct null_eval { // types typedef ; // public member functions (, ) ; };
null_eval
public member functions( expr, context) ;
For N
in [0,Expr arity)
,
evaluate:
proto::eval
(proto::child_c
<N>(expr), context)