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Go 之 接口型函数
效果：利用 GetterFunc 把函数转成接口，来满足 Getter 的要求
优点：可传函数可传实现接口的结构体
// Interface-type functions
func Test1(t *testing.T) {
A := func(getter func() string) string {
return getter()
}
if A(func() string {
return "A"
}) != "A" {
t.Fatal("failed")
}
}
type Getter interface {
Get() string
}
// A GetterFunc implements Getter with a function.
type GetterFunc func() string
// Get implements Getter interface function
func (f GetterFunc) Get() string {
return f()
}
type B struct {
Name string
}
func (b B) Get() string {
return b.Name
}
func Test2(t *testing.T) {
A := func(getter Getter) string {
return getter.Get()
}
if A(GetterFunc(func() string {
return "A"
})) != "A" {
t.Fatal("failed")
}
b := B{
Name: "B",
}
if A(b) != "B" {
t.Fatal("failed")
}
}
出自 动手写分布式缓存 - GeeCache 第二天 单机并发缓存
// A Getter loads data for a key.
type Getter interface {
Get(key string) ([]byte, error)
}
// A GetterFunc implements Getter with a function.
type GetterFunc func(key string) ([]byte, error)
// Get implements Getter interface function
func (f GetterFunc) Get(key string) ([]byte, error) {
return f(key)
}