main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
"unsafe"
)
func main() {
// empty := ""
// dump(empty)
hello := "hello"
dump(hello)
dump("hello")
dump("hello!")
for i := range hello {
dump(hello[i : i+1])
}
dump(string([]byte(hello)))
dump(string([]byte(hello)))
dump(string([]rune(hello)))
}
// StringHeader is used by a string value
// In practice, you should use: reflect.Header
type StringHeader struct {
// points to a backing array's item
pointer uintptr // where it starts
length int // where it ends
}
// dump prints the string header of a string value
func dump(s string) {
ptr := *(*StringHeader)(unsafe.Pointer(&s))
fmt.Printf("%q: %+v\n", s, ptr)
}
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