#ifndef SYS_FSTREAM_H
 #define SYS_FSTREAM_H
 
 #include <memory>
 #include <sstream>
 
 class fstreams_ifc {
     public:
         typedef std::shared_ptr<std::istream> pstream;
         virtual pstream open_fstream(const std::string &file_path) {
             return pstream(new std::istringstream(""));
         }
 };
 
 class fstreams : public fstreams_ifc {
     public:
         typedef std::shared_ptr<fstreams_ifc> delegate;
     private:
         delegate delegate_;
     public:
         fstreams(const delegate &delegate) : delegate_(delegate){}
         fstreams() : fstreams(delegate(new fstreams_ifc)) {}
         pstream open_fstream(const std::string &file_path) {
             return delegate_->open_fstream(file_path);
         }
         static fstreams create();
 };
 
 
 #endif