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Copy pathempty_value.go
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empty_value.go
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33 lines (30 loc) · 837 Bytes
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package missinggo
import "reflect"
func IsZeroValue(i interface{}) bool {
return IsEmptyValue(reflect.ValueOf(i))
}
// Returns whether the value represents the empty value for its type. Used for
// example to determine if complex types satisfy the common "omitempty" tag
// option for marshalling. Taken from
// http://stackoverflow.com/a/23555352/149482.
func IsEmptyValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.Func, reflect.Map, reflect.Slice:
return v.IsNil()
case reflect.Array:
z := true
for i := 0; i < v.Len(); i++ {
z = z && IsEmptyValue(v.Index(i))
}
return z
case reflect.Struct:
z := true
for i := 0; i < v.NumField(); i++ {
z = z && IsEmptyValue(v.Field(i))
}
return z
}
// Compare other types directly:
z := reflect.Zero(v.Type())
return v.Interface() == z.Interface()
}