存储桶列表中存储的项目数

发布于 2024-07-18 06:45:45 字数 332 浏览 11 评论 0原文

我想知道如何获取 TBucketList 中存储的项目数。据我所知，只有存储桶的数量和可用的存储桶数组，所以我能想到的就是

Count := 0;
for I := 0 to BucketList.BucketCount - 1 do
  Inc (Count, BucketList.Buckets [I].Count);

这确实有效，但对我来说似乎很奇怪，我必须迭代所有存储桶才能找到项目的数量存储 - 可能经常需要的东西。

我是否错过了另一种可能性？或者这个容器类没有像其他容器一样提供 Count 成员是否有原因？

谢谢！

原文

I was wondering how to get the number of items stored in a TBucketList. As far as I can see there is only the number of buckets and the bucket array available, so all I can think of is

Count := 0;
for I := 0 to BucketList.BucketCount - 1 do
  Inc (Count, BucketList.Buckets [I].Count);

That does work but it seems odd to me, that I have to iterate through all buckets to find the number of items stored - something that is probably needed very often.

Am I missing another possibility? Or is there a reason why this container class does not provide a Count member like the other containers?

Thanks!

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趁微风不噪 2024-07-25 06:45:45

图书馆永远不会完整。但你可以扩展它们。

如果您经常需要这个值，您可以为此编写一个类帮助器。

TBucketListHelper = class helper for TBucketList
  function GetCount: Integer;
end;

function TBucketListHelper.GetCount: Integer;
var
  i : Integer;
begin
  Result := 0;
  for I := 0 to BucketCount - 1 do
    Inc (Result, Buckets [I].Count);
end;

您现在可以使用：

BucketList.GetCount

如果 TBucketListHelper 在范围内。

Libraries are never complete. But you can extend them.

If you need this value often, you can write a class helper for that.

TBucketListHelper = class helper for TBucketList
  function GetCount: Integer;
end;

function TBucketListHelper.GetCount: Integer;
var
  i : Integer;
begin
  Result := 0;
  for I := 0 to BucketCount - 1 do
    Inc (Result, Buckets [I].Count);
end;

You now can use: