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#include "object.h"

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#include <stdlib.h>

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#include <assert.h>

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void object_init (struct object *obj, const struct object_type *type)

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{

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    // trip on bugs

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    assert(!obj->type);

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    // set type

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    obj->type = type;

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}

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bool object_type_check (const struct object_type *obj_type, const struct object_type *type)

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{

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    const struct object_type *t;

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    // sanity-check

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    assert(obj_type && type);

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    // look for a matching type in the type's inheritance tree

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    for (t = obj_type; t; t = t->parent)

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        if (t == type)

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            break;

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    // t will be (parent == NULL) if we didn't find any matching type

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    return (t != NULL);    

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}

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bool object_check (struct object *obj, const struct object_type *type)

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{

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    // sanity check

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    assert(obj && type);

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    return object_type_check(obj->type, type);

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}

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void* object_cast (struct object *obj, const struct object_type *type)

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{

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    assert(object_type_check(obj->type, type));

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    // ok, return as void*

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    return obj;

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}

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const void* object_type (struct object *obj, const struct object_type *type)

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{

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    assert(object_type_check(obj->type, type));

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    // ok, return as void*

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    return obj->type;

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}