traefik/vendor/github.com/exoscale/egoscale/copier.go

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2018-09-14 08:06:03 +00:00
package egoscale
import (
"fmt"
"reflect"
)
// Copy copies the value from from into to. The type of "from" must be convertible into the type of "to".
func Copy(to, from interface{}) error {
tt := reflect.TypeOf(to)
tv := reflect.ValueOf(to)
ft := reflect.TypeOf(from)
fv := reflect.ValueOf(from)
if tt.Kind() != reflect.Ptr {
return fmt.Errorf("must copy to a pointer, got %q", tt.Name())
}
tt = tt.Elem()
tv = tv.Elem()
for {
if ft.ConvertibleTo(tt) {
break
}
if ft.Kind() == reflect.Ptr {
ft = ft.Elem()
fv = fv.Elem()
} else {
return fmt.Errorf("cannot convert %q into %q", tt.Name(), ft.Name())
}
}
tv.Set(fv.Convert(tt))
return nil
}