有没有办法操纵延迟堆栈? [英] Is there a way to manipulate the defer stack?

问题描述

有什么办法可以改变延迟堆栈?例如，将调用添加到延迟堆栈的底部，还是删除最后放置的延迟?

Is there any way to change the defer stack? For example, adding a call to the bottom of the defer stack, or removing the last defer placed?

推荐答案

对 defer 堆栈的唯一可能修改是将其弹出".

The only modification possible to the defer stack is to "pop" onto it.

话虽如此，您可以将defer设为可选，并使用一个变量从deferred函数中提早退出.示例:

Having said that, you could make a defer optional with a variable to early-exit from the deferred function. Example:

func foo() {
    var skipDefer bool
    defer func() {
        if skipDefer {
            return
        }
        // Do body of defer
    }()
    // Do stuff
    if someConditionIsTrue {
        skipDefer = true
    }
    defer func() {
        // Do this one unconditionally
    }
    // Do other stuff
}

如果您确实想执行以下操作，也可以管理要手动执行的功能列表:

You could also manage a list of functions to be executed manually, if you really want to:

func foo() {
    var deferreds []func()
    defer func() {
        for _, f := range deferreds {
            f()
        }
    }()
    // Add to and arrange `deferreds` to your heart's content

}

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