gen/button_gen.c

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/* THIS IS A GENERATED FILE, DO NOT EDIT!!! */
#include <assert.h>
#include "button_friend_gen.h"

typedef struct button_private_st_ {
    const button_vtable_st *vtable;
} button_private_st;

static void
button_delete_internal (button_handle button_h, 
    bool free_button_h)
{
    if (NULL == button_h) {
        return;
    }

    if (NULL != button_h->private_h) {
        free(button_h->private_h);
        button_h->private_h = NULL;
    }

    if (free_button_h) {
        free(button_h);
    }
}

void
button_friend_delete (button_handle button_h)
{
    button_delete_internal(button_h, false);
}

void
button_paint (button_handle button_h)
{
    assert((NULL != button_h) &&
           (NULL != button_h->private_h) &&
           (NULL != button_h->private_h->vtable) &&
           (NULL != button_h->private_h->vtable->paint_fn));

    return (button_h->private_h->vtable->paint_fn(button_h));
}

void
button_delete (button_handle button_h)
{
    assert((NULL != button_h) &&
           (NULL != button_h->private_h) &&
           (NULL != button_h->private_h->vtable) &&
           (NULL != button_h->private_h->vtable->delete_fn));

    return (button_h->private_h->vtable->delete_fn(button_h));
}

static const button_vtable_st button_vtable = {
    NULL,
    NULL
};

static bool
button_inherit_vtable (const button_vtable_st *parent_vtable,
    button_vtable_st *child_vtable,
    bool do_null_check)
{
    if ((NULL == parent_vtable) || (NULL == child_vtable)) {
        return (false);
    }

    if (NULL == child_vtable->paint_fn) {
        child_vtable->paint_fn = parent_vtable->paint_fn;
        if (do_null_check && (NULL == child_vtable->paint_fn)) {
            return (false);
        }
    }

    if (NULL == child_vtable->delete_fn) {
        child_vtable->delete_fn = parent_vtable->delete_fn;
        if (do_null_check && (NULL == child_vtable->delete_fn)) {
            return (false);
        }
    }

    return (true);
}

bool
button_set_vtable (button_handle button_h, 
    button_vtable_st *vtable)
{
    bool rc;

    if (((NULL == button_h) || (NULL == vtable) ||
         (NULL == button_h->private_h))) {
        return (false);
    }
    
    rc = button_inherit_vtable(&button_vtable, vtable, true);

    if (rc) {
        button_h->private_h->vtable = vtable;
    }

    return (rc);
}

bool
button_init (button_handle button_h)
{
    if (NULL == button_h) {
        return (false);
    }

    button_h->private_h = calloc(1, sizeof(*button_h->private_h));
    if (NULL == button_h->private_h) {
        goto err_exit;
    }

    button_h->private_h->vtable = NULL;

    return (true);

err_exit:

    if (NULL != button_h->private_h) {
        free(button_h->private_h);
        button_h->private_h = NULL;
    }

    return (false);
}