如何调用作为接口传递的对象的嵌入式结构方法？

Question

我的场景需要用户嵌入一个基本结构并实现一个接口。然后，应该将该结构的一个实例传递给一个函数。该函数需要调用基本结构的方法。这失败了// Given base struct and interfacetype Interface interface {    Do()}type BaseStruct struct {    i int    s string}func (*b BaseStruct) Stuff() {}// The user needs to create a struct that embeds BaseStruct and to implement Interface:type CustomStruct struct {    *BaseStruct}func (*c CustomStruct) Do() {}// The user now instantiates the struct and needs to call a functioninst := CustomStruct{}SomePackageFun(&inst)// The below function receives the custom struct, and must call the base struct's method, but this failsfunc SomePackageFunc(i Interface) {    // declaring the function with Interface works but I can't call the methods of BaseStruct    i.Stuff() // not recognized by the compiler} 

Answer 1

如果您希望能够在接口类型的变量上调用方法，则应将该方法添加到接口中。出于满足接口的目的，来自嵌入式结构的方法计数。要调用不属于接口的任何内容，您必须对具体类型（或具有该方法的不同接口类型）进行断言，这违背了这一点。