objiface.h

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#pragma once
 
 
#include <cx/cx.h>
#include <cx/container/sarray.h>
 
 
typedef struct ObjIface ObjIface;
 
typedef struct ObjIface
{
    ObjIface *_implements;      
    ObjIface *_parent;          
    size_t _size;               
 
    // Interface method pointers follow this header
    // The specific methods depend on the interface definition
} ObjIface;
saDeclarePtr(ObjIface);
 
#define objIfTmplName(iface) iface##_tmpl
 
#define objIfImport(iface) extern iface objIfTmplName(iface)
 
#define objIfCheck(iface) static_assert(((iface)->_implements, (iface)->_size, offsetof(*(iface), _parent) == offsetof(ObjIface, _parent)), "Not an interface")
 
#define objIfBase(iface) ((ObjIface*)((iface)->_implements, (iface)->_parent, (iface)->_size, (iface)))