查看您的代码,我可以看到一个问题,它将生成特定的异常错误。
publ_top(_,[],Accumulated,Level) ->
%% Go through the accumulated list of hashes from the prior level
publ_top(string:len(Accumulated),Accumulated,[],Level+1);
publ_top(FullLevelLen,RestofLevel,Accumulated,Level) ->
case FullLevelLen =:= 1 of
false -> [F,S|T]=RestofLevel,
io:format("~w---~w~n",[F,S]),
publ_top(FullLevelLen,T,lists:append(Accumulated,[erlang:phash2(string:concat([F],[S]))]),Level);
true -> done
end.
在第一个函数声明中,您将与空列表匹配。在第二个声明中,您将与长度列表(至少)2匹配(
[F,S|T]
)当
FullLevelLen
不同于1和
RestOfLevel
是长度为1的列表吗?(提示:您将得到上述错误)。
如果您要在函数参数上进行模式匹配,则更容易发现错误,可能类似于:
publ_top(_,[],Accumulated,Level) ->
%% Go through the accumulated list of hashes from the prior level
publ_top(string:len(Accumulated),Accumulated,[],Level+1);
publ_top(1, _, _, _) ->
done;
publ_top(_, [F,S|T], Accumulated, Level) ->
io:format("~w---~w~n",[F,S]),
publ_top(FullLevelLen,T,lists:append(Accumulated,[erlang:phash2(string:concat([F],[S]))]),Level);
%% Missing case:
% publ_top(_, [H], Accumulated, Level) ->
% ...