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boost::proto::_env_var —
A primitive transform that returns the value associated with a particular Key
in the current transform environment.
// In header: <boost/proto/transform/env.hpp> template<typename Key> struct _env_var : proto::transform<_env_var<Key> > { // member classes/structs/unions struct impl : proto::transform_impl<Expr, State, Data> > { // types typedef proto::result_of::env_var< ; // public member functions (, , ) ; }; };