Kotlin：如何延迟初始化向量

Question

When I lazy initialise a vector. I could do it for normal Object class as below.

val mPagerAdapter: PagerAdapter by lazy {
    PagerAdapter(supportFragmentManager, fragments, mTabsName)
}

However, when I lazy initialise a Vector variable as below

val fragments = Vector<Fragment>() by lazy {
    Vector<Fragment>()
}

It gave me error stating Unresolve Reference: by . How to fix this problem that I could lazy initialise it?

Answer 1

在第二种情况下，语法与第一个摘要明显不同（您可以在by之前初始化变量），请比较：

val fragments by lazy { Vector<Fragment>() }