src/collection/option.hpp

Idź do dokumentacji tego pliku.

/*
 panaLiX, Adrian Panasiuk 2002-5,8
 http://panalix.sourceforge.net/
 ad.ek336@gmail.com
 
 small osdev project
 provided under GPLv3 license.
 */


#ifndef __PANALIX_OPTION_HPP
#define __PANALIX_OPTION_HPP

#include "src/common/kmalloc.hpp"
#include "src/common/error.hpp"

namespace Collection {

   template <typename T>
   struct Option {
      private:
         bool isNonev;
         T v;
      public:
         void * operator new(size_t s) {
            return kmalloc(s, "option");
         }
         struct Option & operator=(const struct Option &rhs) {
            this->isNonev = rhs.isNonev;
            this->v = rhs.v;
            return *this;
         }


         bool isNone() {
            return isNonev;
         }
         Option() {
            isNonev=true;
         }
         Option(T v) {
            this->v=v;
            isNonev=false;
         }
         T get() {
            if (isNone()) {
              debug_dump_call_trace();
              sysfail("None.get()"); 
            }
            return v;
         }
         void set(T x) {
            v=x; isNonev=false;
         }
         void setNone() {
            isNonev=true;
         }
   };
}

template <typename T>
inline void print(struct Collection::Option<T> v) {
   if (v.isNone()) print("None");
   else prin("Some ", v.get());
}
#endif

---