晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/usr/include/glib-2.0/glib/
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Current File : //usr/include/glib-2.0/glib/grcbox.h
/* grcbox.h: Reference counted data
 *
 * Copyright 2018  Emmanuele Bassi
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif

#include <glib/gmem.h>

#if defined(glib_typeof_2_68) && GLIB_VERSION_MIN_REQUIRED >= GLIB_VERSION_2_68
/* for glib_typeof */
#include <type_traits>
#endif

G_BEGIN_DECLS

GLIB_AVAILABLE_IN_2_58
gpointer        g_rc_box_alloc                  (gsize           block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer        g_rc_box_alloc0                 (gsize           block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer        g_rc_box_dup                    (gsize           block_size,
                                                 gconstpointer   mem_block) G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer        g_rc_box_acquire                (gpointer        mem_block);
GLIB_AVAILABLE_IN_2_58
void            g_rc_box_release                (gpointer        mem_block);
GLIB_AVAILABLE_IN_2_58
void            g_rc_box_release_full           (gpointer        mem_block,
                                                 GDestroyNotify  clear_func);

GLIB_AVAILABLE_IN_2_58
gsize           g_rc_box_get_size               (gpointer        mem_block);

GLIB_AVAILABLE_IN_2_58
gpointer        g_atomic_rc_box_alloc           (gsize           block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer        g_atomic_rc_box_alloc0          (gsize           block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer        g_atomic_rc_box_dup             (gsize           block_size,
                                                 gconstpointer   mem_block) G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer        g_atomic_rc_box_acquire         (gpointer        mem_block);
GLIB_AVAILABLE_IN_2_58
void            g_atomic_rc_box_release         (gpointer        mem_block);
GLIB_AVAILABLE_IN_2_58
void            g_atomic_rc_box_release_full    (gpointer        mem_block,
                                                 GDestroyNotify  clear_func);

GLIB_AVAILABLE_IN_2_58
gsize           g_atomic_rc_box_get_size        (gpointer        mem_block);

#define g_rc_box_new(type) \
  ((type *) g_rc_box_alloc (sizeof (type)))
#define g_rc_box_new0(type) \
  ((type *) g_rc_box_alloc0 (sizeof (type)))
#define g_atomic_rc_box_new(type) \
  ((type *) g_atomic_rc_box_alloc (sizeof (type)))
#define g_atomic_rc_box_new0(type) \
  ((type *) g_atomic_rc_box_alloc0 (sizeof (type)))

#if defined(glib_typeof) && (!defined(glib_typeof_2_68) || GLIB_VERSION_MIN_REQUIRED >= GLIB_VERSION_2_68)
/* Type check to avoid assigning references to different types */
#define g_rc_box_acquire(mem_block) \
  ((glib_typeof (mem_block)) (g_rc_box_acquire) (mem_block))
#define g_atomic_rc_box_acquire(mem_block) \
  ((glib_typeof (mem_block)) (g_atomic_rc_box_acquire) (mem_block))

/* Type check to avoid duplicating data to different types */
#define g_rc_box_dup(block_size, mem_block) \
  ((glib_typeof (mem_block)) (g_rc_box_dup) (block_size, mem_block))
#define g_atomic_rc_box_dup(block_size, mem_block) \
  ((glib_typeof (mem_block)) (g_atomic_rc_box_dup) (block_size, mem_block))
#endif

G_END_DECLS