Gotcha

gotcha.go

// Online Go compiler to run Golang program online
// Print "Try programiz.pro" message

package main
import "fmt"

// ---

type Restful interface {
    Get() string
    Set() string
}

type Method func(Restful) string 

type Controller interface {
    Restful
    Handler(string) Method
}

type controller [T any] struct {
    route string
    handles map[string]Method
    data T
}

// ---

type blog struct {
    table string
}

type Blog controller[blog]

func NewBlog() Blog {
    return Blog {
        route: "blog",
        handles: map[string]Method {
            "get": Restful.Get,
            "set": Restful.Set,
        },
        data: blog {
            table: "table",
        },
    }
}

func (b *Blog) Handler(m string) Method {
    if h, ok := b.handles[m]; ok {
        return h
    }
    return nil
}

func (b *Blog) Get() string {
    return "B.Get"
}
func (b *Blog) Set() string {
    return "B.Set"
}

// ---

func show(c Controller, m string) {
    if h := c.Handler(m); h != nil {
        fmt.Println(h(c))
    } else {
        fmt.Println("None")
    }
}

func main() {
    b := NewBlog()
    show(&b, "get")
    // show(&PasteController, "get")
    // show(&PasteController, "set")
}