methods - T 和 *T 的方法集

Question

Golang language specification states :

The method set of any other type T consists of all methods with receiver type T. The method set of the corresponding pointer type *T is the set of all methods with receiver *T or T (that is, it also contains the method set of T).

这是为什么？为什么接收T的方法属于为*T设置的方法，反之则不然？

Answer 1

来自FAQ :

If an interface value contains a pointer *T, a method call can obtain a value by dereferencing the pointer, but if an interface value contains a value T, there is no useful way for a method call to obtain a pointer.

顺便说一下，一个带有指针接收者的方法可以改变它的接收者，就像它可以改变一个指针参数一样。将非指针接收器作为指针接收器传递(假设这是可能的)，允许方法更改它，这不应该。

建议对一种类型的所有方法使用一种一致的接收器类型，并避免混合使用指针和直接接收器。还建议对大型类型使用指针接收器。