forked from cerc-io/ipld-eth-server
32 lines
905 B
Go
32 lines
905 B
Go
package obj
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import "reflect"
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// The missing definition of 'reflect.IsZero' you've always wanted.
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func isEmptyValue(v reflect.Value) bool {
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switch v.Kind() {
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case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return v.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return v.Uint() == 0
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case reflect.Float32, reflect.Float64:
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return v.Float() == 0
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case reflect.Interface, reflect.Ptr:
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return v.IsNil()
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case reflect.Struct:
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// Note: we can't rely on a *literal* "is zero" check because
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// non-zero pointers may still point to *empty* things.
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for i := 0; i < v.NumField(); i++ {
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if !isEmptyValue(v.Field(i)) {
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return false
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}
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}
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return true
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}
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return false
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}
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