package cslice_test

/*
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
*/
import "C"

import (
	"fmt"
	"reflect"
	"testing"
	"unsafe"

	"cslice"
)

func ExampleSetAt() {
	var (
		original *C.char  = C.CString("Hello, world!")
		sz       C.size_t = C.strlen(original)
	)
	defer C.free(unsafe.Pointer(original))

	var alias []byte
	cslice.SetAt(&alias, unsafe.Pointer(original), int(sz))

	fmt.Println("original:", C.GoString(original))
	fmt.Println("alias:", string(alias))
	copy(alias, "Adios")
	fmt.Println("original:", C.GoString(original))
	fmt.Println("alias:", string(alias))

	// Output:
	// original: Hello, world!
	// alias: Hello, world!
	// original: Adios, world!
	// alias: Adios, world!
}

func ExampleReflectAt() {
	var (
		original *C.char  = C.CString("Hello, world!")
		sz       C.size_t = C.strlen(original)
	)
	defer C.free(unsafe.Pointer(original))

	alias := cslice.ReflectAt(reflect.TypeOf(byte(0)), unsafe.Pointer(original), int(sz))

	fmt.Println("original:", C.GoString(original))
	fmt.Println("alias:", string(alias.Bytes()))
	reflect.Copy(alias, reflect.ValueOf([]byte("Adios")))
	fmt.Println("original:", C.GoString(original))
	fmt.Println("alias:", string(alias.Bytes()))

	// Output:
	// original: Hello, world!
	// alias: Hello, world!
	// original: Adios, world!
	// alias: Adios, world!
}