QObject 到底有多重?

问题描述

我最近发布了一个关于 QObject 在典型使用场景中的开销的问题，但不幸的是，该问题与另一个在技术上没有回答问题的问题重复.

I recently posted a question about the overhead of QObject in typical usage scenarios, but unfortunately the question got closed as a duplicate of another question that didn't technically answer the question.

更糟糕的是，礼貌地冲过去结束我的问题的仓促的撒玛利亚人"打断了我在运行了几次测试后刚刚完成打字的答案.由于我无法再在原始问题中发布我的发现，我将其发布在这里，以便其他可能需要该信息的人可以使用.

What is worse, the hasty "Samaritans" who politely rushed to close my question interrupted the answer I was just finishing typing after running a few tests. Since I can no longer post my findings in my original question, I'll post it here so it is available to others who might need that information.

推荐答案

很多人都暗示 QObject 很重，但并不清楚它到底有多重.所以我做了一些测量，不是很准确，所有数值都是近似值.

A lot of people have hinted at QObject being heavy, but without any clarity on how heavy is it exactly. So I did some measurements, not very accurate, all values are approximate.

• 未使用的 QObject ~160 字节
• 没有参数的单个自动连接 ~235 字节
• 2 个不带参数的自动连接 ~315 字节
• 3 个自动连接，1 个带有 3 个参数 ~400 字节
• 2 个自动连接，1 个排队，有 3 个参数 ~432 字节

这些数字应该考虑到我使用的是 64 位 Qt 版本.

Those numbers should take into account I am using a 64 bit Qt build.

所以，总而言之，QObject 的开销确实相当大.没有什么可以打喷嚏或过度使用.

So, in conclusion, the overhead of QObject is quite significant indeed. Nothing to sneeze at or overuse.

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