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66 lines
1.2 KiB
Go
66 lines
1.2 KiB
Go
package reflex
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import (
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"encoding/json"
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"net"
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)
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// Zeroer can be implemented by custom types
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// to report whether its current value is zero.
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// Standard Time also implements that.
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type Zeroer interface {
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IsZero() bool
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}
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// IsZero reports whether "v" is zero value or no.
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// The given "v" value can complete the Zeroer interface
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// which can be used to customize the behavior for each type of "v".
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func IsZero(v interface{}) bool {
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switch t := v.(type) {
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case Zeroer: // completes the time.Time as well.
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return t.IsZero()
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case string:
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return t == ""
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case int:
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return t == 0
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case int8:
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return t == 0
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case int16:
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return t == 0
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case int32:
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return t == 0
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case int64:
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return t == 0
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case uint:
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return t == 0
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case uint8:
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return t == 0
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case uint16:
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return t == 0
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case uint32:
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return t == 0
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case uint64:
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return t == 0
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case float32:
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return t == 0
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case float64:
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return t == 0
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case bool:
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return !t
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case []int:
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return len(t) == 0
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case []string:
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return len(t) == 0
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case [][]int:
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return len(t) == 0
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case [][]string:
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return len(t) == 0
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case json.Number:
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return t.String() == ""
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case net.IP:
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return len(t) == 0
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default:
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return false
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}
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}
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