Defer, Panic, and Recover - The Go Programming Language

Andrew Gerrand 4 August 2010 Go has the usual mechanisms for control flow: if, for, switch, goto. It also has the go statement to run code in a separate goroutine. Here I’d like to discuss some of the less common ones: defer, panic, and recover. A defer statement pushes a function call onto a list. The list of saved calls is executed after the surrounding function returns. Defer is commonly used t

[naka-06_18]

defer で後処理を作成でき、戻り値も修正できる。 panic で処理を異常終了させ、 recovery でこの回復ができる。