英文:
Go, in struct how to reference current object (like this in java and c++)?
问题
在Go语言中，this（或者在Python中是self）是用来表示当前对象的指针。在上述代码中，可以使用shape来代替this，因为shape是指向当前对象的指针。
因此，在setAlive函数中，可以使用shape.isAlive = isAlive来设置isAlive的值。
英文:
What is go's this (or self in python) construct?
type Shape struct {
isAlive bool
}
func (shape *Shape) setAlive(isAlive bool) {
}
in the setAlive function how do I do this.isAlive = isAlive; ?
答案1
得分: 6
Go的方法声明在方法名前面有一个所谓的接收器。
在你的例子中，它是(shape *Shape)。
当你调用foo.setAlive(false)时，foo作为shape传递给了setAlive。
所以基本上以下是语法糖
func (shape *Shape) setAlive(isAlive bool) {
shape.isAlive = isAlive
}
foo.setAlive(false)
等同于
func setAlive(shape *Shape, isAlive bool) {
shape.isAlive = isAlive
}
setAlive(foo, false)
英文:
Go's method declarations have a so called receiver in front of the method name.
In your example it's (shape *Shape).
When you call foo.setAlive(false) foo is passed as shape to setAlive.
So basically the following is syntactical sugar
func (shape *Shape) setAlive(isAlive bool) {
shape.isAlive = isAlive
}
foo.setAlive(false)
for
func setAlive(shape *Shape, isAlive bool) {
shape.isAlive = isAlive
}
setAlive(foo, false)
答案2
得分: 4
在你的例子中，shape 是接收器。你甚至可以这样写：
func (this *Shape) setAlive(isAlive bool) {
this.isAlive = isAlive
}
英文:
In your example, shape is the receiver. You could even write it like this:
func (this *Shape) setAlive(isAlive bool) {
this.isAlive = isAlive
}
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