Question

我对Dagger2提出了一个小问题。但首先让我展示示例代码：

@Singleton
@Component(module={ApplicationModule.class})
public Interface ApplicationComponent {

}


@Module
public class ApplicationModule {
    @Provides
    public Context provideContext() {
        return context;   
    }
}

我知道组件中的对象现在是＆＃34; Singletons＆＃34; .. 我的问题......这对模块有什么影响吗？模块也是Singleton吗？

Answer 1

不，除非您为enum NumberOrNothing { Number(i32), Nothing, } use self::NumberOrNothing::{Number,Nothing}; impl NumberOrNothing { fn print(self) { match self { Nothing => println!("The number is: <nothing>"), Number(n) => println!("The number is: {}", n), }; } } fn vec_min(v: &Vec<i32>) -> NumberOrNothing { fn min_i32(a: i32, b: i32) -> i32 { if a < b {a} else {b} } let mut min = Nothing; for e in v.iter() { //Alternatively implicitly and with *e replaced by e: //for e in v { min = Number(match min { Nothing => *e, Number(n) => min_i32(n, *e), }); } min } pub fn main() { let vec = vec![18,5,7,2,9,27]; let foo = Nothing; let min = vec_min(&vec); let min = vec_min(&vec); min.print(); }带注释的提供者方法指定范围，否则模块不会是单例。

@Provides

Dagger2 - 定义范围

1 个答案: