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Struct template impl

boost::proto::_env_var::impl

Synopsis

// In header: <boost/proto/transform/env.hpp>



struct impl :  proto::transform_impl<Expr, State, Data> > {
  // types
  typedef proto::result_of::env_var< ;

  // public member functions
   (, 
                         , 
                         ) ;
};

Description

impl public member functions

  1.  (, , 
                            data) ;

    Fetches the value associated with Key from the transform environment passed in the data (third) parameter.

    Parameters:

    data

    The current transform environment

    Requires:

    proto::is_env<Data>::value is true.

    Returns:

    proto::env_var(data)


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