stream.hh

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#pragma once
 
#include <fstream>
#include <memory>
#include <string>
 
#include <boost/iostreams/filtering_stream.hpp>
 
namespace HEJ{
 
  class istream {
    using boost_istream = boost::iostreams::filtering_istream;
  public:
 
    explicit istream(std::string const & filename);
 
    operator boost_istream& () const noexcept {
      return *stream_;
    }
 
  private:
    std::ifstream file_;
    std::unique_ptr<boost_istream> stream_;
  };
 
}