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 the documentation for a snapshot of the master branch, built from commit 25d613dfbc.
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Struct template env_var

boost::proto::functional::env_var — A unary PolymorphicFunctionObject used for fetching the value associated with a particular key in a transform environment.

Synopsis

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

template<typename Key> 
struct env_var :  proto::callable {
  // member classes/structs/unions
  template<typename Sig> 
  struct result {
    // types
    typedef see-below type;
  };

  // public member functions
  template<typename Env> see-below operator()(Env const &) const;
};

Description

env_var public member functions

  1. template<typename Env> see-below operator()(Env const & e) const;

    This function behaves as follows:

    See proto::env::operator[] for additional information.


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