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49 lines
1.0 KiB
Go
49 lines
1.0 KiB
Go
// reflect.go
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package main
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import (
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"fmt"
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"reflect"
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)
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type NotknownType struct {
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s1, s2, s3 string
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}
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func (n NotknownType) String() string {
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return n.s1 + " - " + n.s2 + " - " + n.s3
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}
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// variable to investigate:
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var secret interface{} = NotknownType{"Ada", "Go", "Oberon"}
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func main() {
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value := reflect.ValueOf(secret) // <main.NotknownType Value>
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typ := reflect.TypeOf(secret) // main.NotknownType
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// alternative:
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//typ := value.Type() // main.NotknownType
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fmt.Println(typ)
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knd := value.Kind() // struct
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fmt.Println(knd)
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// iterate through the fields of the struct:
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for i := 0; i < value.NumField(); i++ {
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fmt.Printf("Field %d: %v\n", i, value.Field(i))
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// error: panic: reflect.Value.SetString using value obtained using unexported field
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//value.Field(i).SetString("C#")
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}
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// call the first method, which is String():
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results := value.Method(0).Call(nil)
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fmt.Println(results) // [Ada - Go - Oberon]
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}
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/* Output:
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main.NotknownType
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struct
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Field 0: Ada
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Field 1: Go
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Field 2: Oberon
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[Ada - Go - Oberon]
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*/
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