Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is an older version of Boost and was released in 2014. The current version is 1.89.0.

Function env_var

Function env_var

boost::proto::env_var — For fetching the value from a transform environment corresponding to the specified Key.

Synopsis

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


template<typename Key, typename Env> 
  typename proto::result_of::env_var<Env &, Key>::type env_var(Env & e);
template<typename Key, typename Env> 
  typename proto::result_of::env_var<Env const &, Key>::type 
  env_var(Env const & e);

Description

See also:

proto::functional::env_var::operator()

Returns:

proto::functional::env_var<Key>()(e)