Golang 推迟对调用者/外部函数采取行动？

Question

是否可以延迟到外部函数的末尾？

// normal transaction
func dbStuff(){
    db.Begin()
    ...
    db.Commit()
}

// normal transaction w/ defer
func dbStuff(){
    db.Begin()
    defer db.Commit()
    ...
}

这可能吗？

// can you defer to caller / outer function?
func dbStuff(){
    db.Trans()
    ...
}

// will Commit() when dbStuff() returns
func (db Db) Trans(){
    db.Begin()
    defer db.Commit() // to caller/outer function
}

Answer 1

根据规范，不可能:

A "defer" statement invokes a function whose execution is deferred to the moment the surrounding function returns, either because the surrounding function executed a return statement, reached the end of its function body, or because the corresponding goroutine is panicking.

(强调我的)

更新:除此之外，这也不是一个好主意——Go 的优势之一是“所见即所得”。将函数从内部函数延迟到外部函数会在您的控制流中产生“不可见”的变化。