Help us understand the problem. What is going on with this article?

[cocos2dx]runActionから他のNodeのActionを呼び出す

More than 3 years have passed since last update.

サンプル

// NG

Node* nodeA;
Action* actionA = Sequence::create(...);

Node* nodeB;
Action* actionB = Sequence::create(...,
  CallFunc::create[nodeA, actionA](){
    nodeA->runAction(actionA);
  }),
  nullptr);

nodeB->runAction(actionB);

// OK

Node* nodeA;
Action* actionA = CallFunc::create([nodeA](){
  nodeA->runAction(Sequence::create(...));  
});

Node* nodeB;
Action* actionB = Sequence::create(..., actionA, nullptr);
nodeB->runAction(actionB);

解説

NGパターンでは、actionAがスコープを抜けたタイミングで、リリースされてしまうため、actionB内でいざ実行しようとした時には、存在が抹消されています。

別解

NGパターンのactionAを作ったタイミングで、
actionA->retain();
しておく方法もあるかと思いますが、releaseするタイミングが難しい気がしたので、未検証です。

(actionAが呼ばれてrunActionされた後であれば、確実に呼ばれるタイミングでreleaseしておけば大丈夫かも?)

いずれにせよ、メモリリークの危険を生まない方法で実装できるならそれに越したことがないと思います。まる。

nunu-e64
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
No comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
ユーザーは見つかりませんでした