On 02/08/2017 10:55 PM, Ron Evans wrote:
|
packagemain
import"fmt"
type tableServer struct{
table int
}
type TableServerinterface{
SetTable(table int)
GetTable()int
}
func NewTableServer()TableServer{
return&tableServer{}
}
func (i *tableServer)SetTable(table int){
i.table =table
}
func (i *tableServer)GetTable()int{
returni.table
}
func SetTable(table int)func(*tableServer){
returnfunc(i *tableServer){
i.SetTable(table)
}
}
type Waiterstruct{
Namestring
TableServer
}
func NewWaiter(name string,options ...func(*Waiter))*Waiter{
w :=&Waiter{
Name: name,
TableServer:NewTableServer(),
}
for_,option :=range options {
option(w)
}
returnw
}
func main(){
waiter :=NewWaiter("joe")
fmt.Println(waiter.Name,"is working table",waiter.GetTable())
// the following line cannot compile, with error:
// ./opts.go:56: cannot use SetTable(9) (type func(*tableServer)) as
type func(*Waiter) in argument to NewWaiter
waiter =NewWaiter("bob",SetTable(9))
fmt.Println(waiter.Name,"is working table",waiter.GetTable())
}
|
Error is selfexplanatory, signatures func(*tableServer) and
func(*Waiter) denote different types. Don't sure I understand precisely
what you want to achieve, but changing
func NewWaiter(name string, options ...func(TableServer)) *Waiter {
...
//and
func SetTable(table int) func(TableServer) {
return func(i TableServer) {
i.SetTable(table)
}
}
make code at least compile and run.
__
Ilya
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