「Flutter/dart/singleton」の版間の差分
提供: 初心者エンジニアの簡易メモ
(ページの作成:「<pre> class SingletonHoge { SingletonHoge._privateConstructor(); static final SingletonHoge _instance = SingletonHoge._privateConstructor(); static SingletonHoge ge...」) |
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| (同じ利用者による、間の3版が非表示) | |||
| 行1: | 行1: | ||
<pre> | <pre> | ||
class SingletonHoge { | class SingletonHoge { | ||
| − | + | String name = ""; | |
| − | static final SingletonHoge | + | static final SingletonHoge _singleton = SingletonHoge._internal(); |
| − | + | factory SingletonHoge() { | |
| − | return | + | return _singleton; |
| + | } | ||
| + | SingletonHoge._internal() { | ||
| + | // init | ||
} | } | ||
} | } | ||
| + | |||
| + | </pre> | ||
| + | <pre> | ||
| + | SingletonHoge hoge = SingletonHoge(); | ||
| + | print (hoge.name); // "" | ||
| + | hoge.name = "taro"; | ||
| + | print (hoge.name); // "taro" | ||
</pre> | </pre> | ||
| + | https://stackoverflow.com/questions/12649573/how-do-you-build-a-singleton-in-dart | ||
2019年12月2日 (月) 22:25時点における版
class SingletonHoge {
String name = "";
static final SingletonHoge _singleton = SingletonHoge._internal();
factory SingletonHoge() {
return _singleton;
}
SingletonHoge._internal() {
// init
}
}
SingletonHoge hoge = SingletonHoge(); print (hoge.name); // "" hoge.name = "taro"; print (hoge.name); // "taro"
https://stackoverflow.com/questions/12649573/how-do-you-build-a-singleton-in-dart
