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Function has_env_var

boost::proto::has_env_var — For testing to see whether a value exists in a transform environment corresponding to the specified Key.

Synopsis

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


template<typename Key, typename Env> 
  proto::result_of::has_env_var< 
  ( e);
template<typename Key, typename Env> 
  proto::result_of::has_env_var< 
  ( e);

Description

See also:


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