You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.3 KiB
Go
75 lines
1.3 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
)
|
|
|
|
type accumulator struct {
|
|
name string
|
|
floatFn func(float64, float64) (float64, error)
|
|
intFn func(int64, int64) (int64, error)
|
|
acc int64
|
|
accf float64
|
|
floating bool
|
|
}
|
|
|
|
func (a *accumulator) total(vals ...interface{}) (interface{}, error) {
|
|
if len(vals) == 0 {
|
|
return int64(0), nil
|
|
}
|
|
|
|
switch v := vals[0].(type) {
|
|
case int64:
|
|
a.acc = v
|
|
case float64:
|
|
a.floating = true
|
|
a.accf = v
|
|
default:
|
|
return nil, fmt.Errorf("%v is not defined for %v", a.name, reflect.TypeOf(v))
|
|
}
|
|
|
|
if len(vals) == 1 {
|
|
if a.floating {
|
|
return a.accf, nil
|
|
} else {
|
|
return a.acc, nil
|
|
}
|
|
}
|
|
|
|
for _, raw := range vals[1:] {
|
|
switch v := raw.(type) {
|
|
case int64:
|
|
var err error
|
|
if a.floating {
|
|
a.accf, err = a.floatFn(a.accf, float64(v))
|
|
} else {
|
|
a.acc, err = a.intFn(a.acc, v)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case float64:
|
|
var err error
|
|
if a.floating {
|
|
a.accf, err = a.floatFn(a.accf, v)
|
|
} else {
|
|
a.floating = true
|
|
a.accf, err = a.floatFn(a.accf, float64(a.acc))
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
default:
|
|
return nil, fmt.Errorf("%v is not defined for %v", a.name, reflect.TypeOf(v))
|
|
}
|
|
}
|
|
|
|
if a.floating {
|
|
return a.accf, nil
|
|
} else {
|
|
return a.acc, nil
|
|
}
|
|
panic("not reached")
|
|
}
|