Question

如下面的代码所示，我正在对interface{}进行某种类型切换，以便进行正确的类型切换 - 我尝试将interface{}转换为float64或者string或==，然后将其与值进行比较，但是，在float64上使用invalid operation: (interface {})(val.(float64)) > subval.Value (operator > not defined on interface) invalid operation: (interface {})(val.(float64)) >= subval.Value (operator >= not defined on interface) invalid operation: (interface {})(val.(float64)) < subval.Value (operator < not defined on interface) invalid operation: (interface {})(val.(float64)) <= subval.Value (operator <= not defined on interface)以外的比较运算符时，Go在建造时抱怨它。

Go吐出的错误如下： -

val:= s.FieldByName(subval.Metric).Interface()
switch val(type) {
case float64, float32, int:
    switch subval.Type {
    case "greater_than":
        if val.(float64) > subval.Value {
            runAction(subval.Action, Config)
        }
    case "greater_than_or_equal_to":
        if val.(float64) >= subval.Value {
            runAction(subval.Action, Config)
        }
    case "equal_to":
        if val.(float64) == subval.Value {
            runAction(subval.Action, Config)
        }
    case "less_than":
        if val.(float64) < subval.Value {
            runAction(subval.Action, Config)
        }
    case "less_than_or_equal_to":
        if val.(float64) <= subval.Value {
            runAction(subval.Action, Config)
        }
    }
case string:
    if subval.Type == "equal_to" {
        if val.(string) == subval.Value {
            runAction(subval.Action, Config)
        }
    }
}

...这是我的代码： -

{{1}}

Answer 1

您的问题可能是subval.Value是interface{}，因此比较运算符不可用。我认为在与接口进行相等比较时，请按字节顺序比较基础类型，因此==不会出错。

Golang - 未在转换为float64的接口上定义的比较运算符

1 个答案: