acl/lib_acl_cpp/include/acl_cpp/redis/redis_set.hpp

#pragma once
#include "acl_cpp/acl_cpp_define.hpp"
#include <vector>
#include "acl_cpp/stdlib/string.hpp"
#include "acl_cpp/redis/redis_command.hpp"

namespace acl
{

class redis_client;

class ACL_CPP_API redis_set : virtual public redis_command
{
public:
	/**
	 * see redis_command::redis_command()
	 */
	redis_set(void);

	/**
	 * see redis_command::redis_command(redis_client*)
	 */
	redis_set(redis_client* conn);

	/**
	 * see redis_command::redis_command(redis_client_cluster*<EFBFBD><EFBFBD> size_t)
	 */
	redis_set(redis_client_cluster* cluster, size_t max_conns = 0);

	virtual ~redis_set(void);

	/////////////////////////////////////////////////////////////////////

	/**
	 * <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> member Ԫ<EFBFBD>ؼ<EFBFBD><EFBFBD>뵽<EFBFBD><EFBFBD><EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD>Ѿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڼ<EFBFBD><EFBFBD>ϵ<EFBFBD> member Ԫ<EFBFBD><EFBFBD>
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
	 * 1) <EFBFBD><EFBFBD><EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD>򴴽<EFBFBD>һ<EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> member Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>
	 * 2) <EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD>Ǽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * add one or more members to a set stored at a key
	 * 1) if the key doesn't exist, a new set by the key will be created,
	 *    and add the members to the set
	 * 2) if the key exists and not a set's key, then error happened
	 * @param key {const char*} <EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>
	 *  the key of a set
	 * @param first_member {const char*} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> NULL <EFBFBD>ij<EFBFBD>Ա
	 *  the first member of a variable args which isn't NULL, the last
	 *  arg of the args must be NULL indicating the end of args
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ե<EFBFBD>Ԫ<EFBFBD><EFBFBD>
	 *  the number of elements that were added to the set, not including
	 *  all the elements already present into the set. -1 if error
	 *  happened or it isn't a set stored by the key.
	 */
	int sadd(const char* key, const char* first_member, ...);
	int sadd(const char* key, const std::vector<const char*>& memsbers);
	int sadd(const char* key, const std::vector<string>& members);
	int sadd(const char* key, const char* argv[], size_t argc);
	int sadd(const char* key, const char* argv[], const size_t lens[],
		size_t argc);

	/**
	 * <EFBFBD>Ӽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա
	 * remove and get one member from the set
	 * @param key {const char*} <EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>
	 *  the key of the set
	 * @param buf {string&} <EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD>Ƴ<EFBFBD><EFBFBD>ij<EFBFBD>Ա
	 *  store the member removed from the set
	 * @return {bool} <EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD> key <EFBFBD>ǿռ<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> false
	 *  true if one member has been removed and got, false if the key
	 *  doesn't exist or it isn't a set stored at the key.
	 */
	bool spop(const char* key, string& buf);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>г<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * get the number of members in a set stored at the key
	 * @param key {const char*} <EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>
	 *  the key of the set
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD>ظü<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>г<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD>
	 *  return int value as below:
	 *  -1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>
	 *      error or it's not a set by the key
	 *   0<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *      the set is empty or the key doesn't exist
	 *  >0<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD>
	 *      the number of members in the set
	 */
	int scard(const char* key);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD>ؼ<EFBFBD><EFBFBD><EFBFBD> key <EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD>г<EFBFBD>Ա
	 * get all the members in a set stored at a key
	 * @param key {const char*} <EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ֵ
	 *  the key of the set
	 * @param members {std::vector<string>*} <EFBFBD>ǿ<EFBFBD>ʱ<EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  if not NULL, it will store the members.
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> -1 <EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> key <EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>
	 *  the number of elements got, -1 if error happened or it't not
	 *  a set by the key.
	 *
	 *  <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  if successul, one of below ways can be used to get the result:
	 *  1<EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿյĴ洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>ַ
	 *     the most easily way is to set a non-NULL result parameter
	 *     for this function 
	 *  2<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_value <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>±<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     call redis_command::result_value with the specified subscript
	 *  3<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_child <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>±<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>ض<EFBFBD><EFBFBD><EFBFBD>(redis_result<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD>
	 *     redis_result::argv_to_string <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     get redis_result object with the given subscript, and get the
	 *     element by redis_result::argv_to_string
	 *  4<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_result <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD>ܽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> redis_result<EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD>
	 *     redis_result::get_child <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Ԫ<EFBFBD>ض<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ 2 <EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
	 *     <EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ø<EFBFBD>Ԫ<EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     get redis_result object by redis_command::get_result, and get
	 *     the first element by redis_result::get_child, then get the
	 *     element by the way same as the way 2 above
	 *  5<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_children <EFBFBD><EFBFBD><EFBFBD>ý<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD> redis_result <EFBFBD><EFBFBD>
	 *     <EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD> argv_to_string <EFBFBD><EFBFBD>ÿһ<EFBFBD><EFBFBD>Ԫ<EFBFBD>ض<EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     get child array by redis_command::get_children, and get the
	 *     element from one of redis_result array by argv_to_string
	 */
	int smembers(const char* key, std::vector<string>* members);

	/**
	 * <EFBFBD><EFBFBD> member Ԫ<EFBFBD>ش<EFBFBD> src <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƶ<EFBFBD><EFBFBD><EFBFBD> dst <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * move a member from one set to another
	 * @param src {const char*} Դ<EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ֵ
	 *  the source key of a set
	 * @param dst {const char*} Ŀ<EFBFBD>꼯<EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ֵ
	 *  the destination key of a set
	 * @param member {const char*} Դ<EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD>Ա
	 *  the member in the source set
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD>
	 *  return int value as below:
	 *  -1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դ/Ŀ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>
	 *      error happened, or one of source and destination isn't a set
	 *   0<EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD>󲻴<EFBFBD><EFBFBD>ڻ<EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     the source set or the member doesn't exist
	 *   1<EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>н<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD>ƶ<EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *      move successfully the member from source set to
	 *      the destination set
	 */
	int smove(const char* src, const char* dst, const char* member);
	int smove(const char* src, const char* dst, const string& member);
	int smove(const char* src, const char* dst,
		const char* member, size_t len);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>и<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD>IJ
	 * return the members of the set resulting from the difference
	 * between the first set and all the successive sets.
	 * @param members {std::vector<string>*} <EFBFBD>ǿ<EFBFBD>ʱ<EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  if not NULL, it will store the members.
	 * @param first_key {const char*} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ǿյļ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD> key
	 *  the key of the first set in a variable sets list, the last one
	 *  must be NULL indicating the end of the sets list.
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> -1 <EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> key <EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>
	 *  the number of elements got, -1 if error happened or it't not
	 *  a set by the key.
	 *  <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  if successul, one of below ways can be used to get the result:
	 *  1<EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿյĴ洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>ַ
	 *     the most easily way is to set a non-NULL result parameter
	 *     for this function
	 *  2<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_value <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>±<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     get the specified subscript's element by redis_command::get_value
	 *  3<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_child <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>±<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>ض<EFBFBD><EFBFBD><EFBFBD>(redis_result<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD>
	 *     redis_result::argv_to_string <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     get redis_result object with the given subscript, and get the
	 *     element by redis_result::argv_to_string
	 *  4<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_result <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD>ܽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> redis_result<EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD>
	 *     redis_result::get_child <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Ԫ<EFBFBD>ض<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ 2 <EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
	 *     <EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ø<EFBFBD>Ԫ<EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     get redis_result object by redis_command::get_result, and get
	 *     the first element by redis_result::get_child, then get the
	 *     element by the way same as the way 2 above.
	 *  5<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>෽<EFBFBD><EFBFBD> get_children <EFBFBD><EFBFBD><EFBFBD>ý<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD> redis_result <EFBFBD><EFBFBD>
	 *     <EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD> argv_to_string <EFBFBD><EFBFBD>ÿһ<EFBFBD><EFBFBD>Ԫ<EFBFBD>ض<EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     get child array by redis_command::get_children, and get the
	 *     element from one of redis_result array by argv_to_string
	 */
	int sdiff(std::vector<string>* members, const char* first_key, ...);
	int sdiff(const std::vector<const char*>& keys,
		std::vector<string>* members);
	int sdiff(const std::vector<string>& keys,
		std::vector<string>* members);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>и<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵĽ<EFBFBD><EFBFBD><EFBFBD>
	 * return the members of a set resulting from the intersection of
	 * all the give sets.
	 * @param members {std::vector<string>*} <EFBFBD>ǿ<EFBFBD>ʱ<EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  if not NULL, it will store the result
	 * @param first_key {const char*} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD> key<EFBFBD><EFBFBD><EFBFBD><EFBFBD>NULL<EFBFBD><EFBFBD>
	 *  the key of the first set in a variable set list, which isn't NULL,
	 *  the last one must be NULL in the set list.
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> -1 <EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> key <EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>
	 *  return the number of the members, -1 if error happened or
	 *  it't not a set by the key.
	 */
	int sinter(std::vector<string>* members, const char* first_key, ...);
	int sinter(const std::vector<const char*>& keys,
		std::vector<string>* members);
	int sinter(const std::vector<string>& keys,
		std::vector<string>* members);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD>ȫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>и<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵIJ<EFBFBD><EFBFBD><EFBFBD>
	 * return the members of a set resulting from the union of all the
	 * given sets.
	 * @param members {std::vector<string>*} <EFBFBD>ǿ<EFBFBD>ʱ<EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  if not NULL, it will store the result
	 * @param first_key {const char*} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD> key<EFBFBD><EFBFBD><EFBFBD><EFBFBD>NULL<EFBFBD><EFBFBD>
	 *  the key of the first set in a variable set list, which isn't NULL,
	 *  and the last arg must be NULL indicating the end of the set list.
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> -1 <EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> key <EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>
	 *  return the number of members, -1 if error happened or it's not
	 *  a set by the key.
	 */
	int sunion(std::vector<string>* members, const char* first_key, ...);
	int sunion(const std::vector<const char*>& keys,
		std::vector<string>* members);
	int sunion(const std::vector<string>& keys,
		std::vector<string>* members);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ú<EFBFBD> SDIFF <EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>浽 dst <EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǽ򵥵ط<EFBFBD><EFBFBD>ؽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * This command is equal to SDIFF, but instead of returning
	 * the resulting set, it is stored in destination.
	 * @param dst {const char*} Ŀ<EFBFBD>꼯<EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
	 *  the key of the destination set
	 * @param first_key {const char*} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ǿյļ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
	 *  the key of the first set in a variable set list, which isn't NULL,
	 *  and the last arg must be NULL indicating the end of the set list. 
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еij<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  return the number of members, -1 if error happened or it's not
	 *  a set by the key.
	 */
	int sdiffstore(const char* dst, const char* first_key, ...);
	int sdiffstore(const char* dst, const std::vector<const char*>& keys);
	int sdiffstore(const char* dst, const std::vector<string>& keys);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> SINTER <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>浽 dst <EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǽ򵥵ط<EFBFBD><EFBFBD>ؽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * This command is equal to SINTER, but instead of returning
	 * the resulting set, it is stored in destination.
	 * @param dst {const char*} Ŀ<EFBFBD>꼯<EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
	 *  the key of the destination set
	 * @param first_key {const char*} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ǿյļ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
	 *  the key of the first set in a variable set list, which isn't NULL,
	 *  and the last arg must be NULL indicating the end of the set list.
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еij<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  return the number of members, -1 if error happened or it's not
	 *  a set by the key.
	 */
	int sinterstore(const char* dst, const char* first_key, ...);
	int sinterstore(const char* dst, const std::vector<const char*>& keys);
	int sinterstore(const char* dst, const std::vector<string>& keys);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> SUNION <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>浽 dst <EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǽ򵥵ط<EFBFBD><EFBFBD>ؽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * This command is equal to SUNION, but instead of returning
	 * the resulting set, it is stored in destination.
	 * @param dst {const char*} Ŀ<EFBFBD>꼯<EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
	 *  the key of the destination set
	 * @param first_key {const char*} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ǿյļ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
	 *  the key of the first set in a variable set list, which isn't NULL,
	 *  and the last arg must be NULL indicating the end of the set list.
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еij<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  return the number of members, -1 if error happened or it's not
	 *  a set by the key.
	 */
	int sunionstore(const char* dst, const char* first_key, ...);
	int sunionstore(const char* dst, const std::vector<const char*>& keys);
	int sunionstore(const char* dst, const std::vector<string>& keys);

	/**
	 * <EFBFBD>ж<EFBFBD> member Ԫ<EFBFBD><EFBFBD><EFBFBD>Ƿ񼯺<EFBFBD> key <EFBFBD>ij<EFBFBD>Ա
	 * determine if a given value is a member of a set
	 * @param key {const char*} <EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ֵ
	 *  the key of a set
	 * @param member {const char*} <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
	 *  the given value
	 * @return {bool} <EFBFBD><EFBFBD><EFBFBD><EFBFBD> true <EFBFBD><EFBFBD>ʾ<EFBFBD>ǣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ǻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  <EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>
	 *  true if the given is a member of the set, false if it's not a
	 *  member of the set, or error, or it's not a set by the key.
	 */
	bool sismember(const char* key, const char* member);
	bool sismember(const char* key, const char* member, size_t len);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>ֻ<EFBFBD>ṩ<EFBFBD><EFBFBD> key <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD>ؼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>أ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬʱָ<EFBFBD><EFBFBD>
	 * <EFBFBD><EFBFBD>Ԫ<EFBFBD>ظ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>᷵<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ø<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƵĽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * get one or multiple memebers from a set
	 * @param key {const char*} <EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ֵ
	 *  the key of a set
	 * @param out <EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  store the result
	 * @return {int} <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ -1 <EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>0 <EFBFBD><EFBFBD>ʾû<EFBFBD>г<EFBFBD>Ա
	 *  the number of members, 0 if the set by the key is empty,
	 *  -1 if error happened.
	 */
	int srandmember(const char* key, string& out);
	int srandmember(const char* key, size_t n, std::vector<string>& out);

	/**
	 * <EFBFBD>Ƴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> key <EFBFBD>е<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> member Ԫ<EFBFBD>أ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD> member Ԫ<EFBFBD>ػᱻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 * Remove the specified members from the set stored at key. if the
	 * member doesn't exist, it will be ignored.
	 * @param key {const char*} <EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ֵ
	 *  the key of the set
	 * @param first_member {const char*} <EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD>Ƴ<EFBFBD><EFBFBD>ij<EFBFBD>Ա<EFBFBD>б<EFBFBD><EFBFBD>ĵ<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> NULL<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>
	 *  <EFBFBD>ڱ<EFBFBD><EFBFBD>ε<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д NULL
	 *  the first non-NULL member to be removed in a variable member list,
	 *  and the last one must be NULL indicating the end of the list.
	 * @retur {int} <EFBFBD><EFBFBD><EFBFBD>Ƴ<EFBFBD><EFBFBD>ij<EFBFBD>ԱԪ<EFBFBD>صĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǽ<EFBFBD><EFBFBD>϶<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> -1<EFBFBD><EFBFBD><EFBFBD><EFBFBD> key <EFBFBD><EFBFBD>
	 *  <EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> 0
	 *  the number of members be removed, 0 if the set is empty or the
	 *  key doesn't exist, -1 if error happened or it's not a set by key
	 */
	int srem(const char* key, const char* first_member, ...);
	int srem(const char* key, const std::vector<string>& members);
	int srem(const char* key, const std::vector<const char*>& members);
	int srem(const char* key, const char* members[],
		size_t lens[], size_t argc);

	/**
	 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݿ<EFBFBD><EFBFBD><EFBFBD>
	 * scan the members in a set stored at key
	 * @param key {const char*} <EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD>ֵ
	 *  the key of a set
	 * @param cursor {int} <EFBFBD>α<EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>ֵд 0
	 *  the cursor value, which is 0 at begin
	 * @param out {std::vector<string>&} <EFBFBD>洢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD>׷<EFBFBD>ӷ<EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>α<EFBFBD><EFBFBD><EFBFBD>
	 *  <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD>Ϊ<EFBFBD><EFBFBD>ֹ<EFBFBD><EFBFBD><EFBFBD>ܽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¸<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD>ñ<EFBFBD>
	 *  <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *  store result in appending mode.
	 * @param pattern {const char*} ƥ<EFBFBD><EFBFBD>ģʽ<EFBFBD><EFBFBD>glob <EFBFBD><EFBFBD><EFBFBD>񣬷ǿ<EFBFBD>ʱ<EFBFBD><EFBFBD>Ч
	 *  match pattern, effective only on no-NULL
	 * @param count {const size_t*} <EFBFBD>޶<EFBFBD><EFBFBD>Ľ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD>ָ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>Ч
	 *  the max count of one scan process, effective only on no-NULL
	 * @return {int} <EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>α<EFBFBD>λ<EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD>
	 *  return the next cursor position, as below:
	 *   0<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     scan finish
	 *  -1: <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	 *     some error happened
	 *  >0: <EFBFBD>α<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>λ<EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>ٽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> out<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>
	 *     the next cursor postion to scan
	 */
	int sscan(const char* key, int cursor, std::vector<string>& out,
		const char* pattern = NULL, const size_t* count = NULL);
};

} // namespace acl