ref.h

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#pragma once
 
#include <derive-c/core/namespace.h>
#include <derive-c/core/panic.h>
#include <derive-c/core/std/reflect.h>
 
#define DC_TRAIT_REFERENCABLE(SELF)                                                                \
    DC_REQUIRE_TYPE(SELF, ref);                                                                    \
    DC_STATIC_ASSERT(sizeof(NS(SELF, ref)) <= sizeof(SELF*),                                       \
                     "Reference type must be at most pointer sized");                              \
    DC_REQUIRE_METHOD(SELF*, NS(SELF, ref), deref, (NS(SELF, ref)))
 
#define DC_TRAIT_REFERENCABLE_BY_PTR(SELF)                                                         \
    typedef SELF* NS(SELF, ref);                                                                   \
    DC_PUBLIC static SELF* NS(NS(SELF, ref), deref)(NS(SELF, ref) ref) { return ref; }             \
    DC_TRAIT_REFERENCABLE(SELF)
 
#define DC_TRAIT_REFERENCABLE_SINGLETON(SELF, INSTANCE)                                            \
    DC_ZERO_SIZED(NS(SELF, ref));                                                                  \
    DC_PUBLIC static NS(SELF, ref) NS(SELF, get_ref)() { return (NS(SELF, ref)){}; }               \
    DC_PUBLIC static SELF* NS(NS(SELF, ref), deref)(NS(SELF, ref) /*ref*/) { return &INSTANCE; }   \
    DC_TRAIT_REFERENCABLE(SELF)