有没有办法在GO中操纵延迟堆栈？

Question

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?

Answer 1

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

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
}

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

}