You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
1.5 KiB
55 lines
1.5 KiB
// Property lists.
|
|
|
|
#ifndef _CL_PROPLIST_H
|
|
#define _CL_PROPLIST_H
|
|
|
|
#include "cln/symbol.h"
|
|
#include "cln/malloc.h"
|
|
|
|
namespace cln {
|
|
|
|
// The only extensible way to extend objects at runtime in an extensible
|
|
// and decentralized way (without having to modify the object's class)
|
|
// is to add a property table to every object.
|
|
// For the moment, only very few properties are planned, so lists should be
|
|
// enough. Since properties represent additional information about the object,
|
|
// there is no need for removing properties, so singly linked lists will be
|
|
// enough.
|
|
|
|
// This is the base class for all properties.
|
|
struct cl_property {
|
|
private:
|
|
cl_property* next;
|
|
public:
|
|
cl_symbol key;
|
|
// Constructor.
|
|
cl_property (const cl_symbol& k) : next (NULL), key (k) {}
|
|
// Destructor.
|
|
virtual ~cl_property () {}
|
|
// Allocation and deallocation.
|
|
void* operator new (size_t size) { return malloc_hook(size); }
|
|
void operator delete (void* ptr) { free_hook(ptr); }
|
|
private:
|
|
virtual void dummy ();
|
|
// Friend declarations. They are for the compiler. Just ignore them.
|
|
friend class cl_property_list;
|
|
};
|
|
#define SUBCLASS_cl_property() \
|
|
void* operator new (size_t size) { return malloc_hook(size); } \
|
|
void operator delete (void* ptr) { free_hook(ptr); }
|
|
|
|
struct cl_property_list {
|
|
private:
|
|
cl_property* list;
|
|
public:
|
|
cl_property* get_property (const cl_symbol& key);
|
|
void add_property (cl_property* new_property);
|
|
// Constructor.
|
|
cl_property_list () : list (NULL) {}
|
|
// Destructor.
|
|
~cl_property_list ();
|
|
};
|
|
|
|
} // namespace cln
|
|
|
|
#endif /* _CL_PROPLIST_H */
|