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。 .
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Current File : //usr/include/linux/stddef.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_STDDEF_H
#define _LINUX_STDDEF_H



#ifndef __always_inline
#define __always_inline __inline__
#endif

/**
 * __struct_group() - Create a mirrored named and anonyomous struct
 *
 * @TAG: The tag name for the named sub-struct (usually empty)
 * @NAME: The identifier name of the mirrored sub-struct
 * @ATTRS: Any struct attributes (usually empty)
 * @MEMBERS: The member declarations for the mirrored structs
 *
 * Used to create an anonymous union of two structs with identical layout
 * and size: one anonymous and one named. The former's members can be used
 * normally without sub-struct naming, and the latter can be used to
 * reason about the start, end, and size of the group of struct members.
 * The named struct can also be explicitly tagged for layer reuse, as well
 * as both having struct attributes appended.
 */
#define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
	union { \
		struct { MEMBERS } ATTRS; \
		struct TAG { MEMBERS } ATTRS NAME; \
	}

#endif

/*
 * __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
 *
 * @TYPE: The type of each flexible array element
 * @NAME: The name of the flexible array member
 *
 * In order to have a flexible array member in a union or alone in a
 * struct, it needs to be wrapped in an anonymous struct with at least 1
 * named member, but that member can be empty.
 */
#define __DECLARE_FLEX_ARRAY(TYPE, NAME)	\
	struct { \
		struct { } __empty_ ## NAME; \
		TYPE NAME[]; \
	}

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