将整数转换为指针？

Question

in C/C++ I can cast int to a int* like this

int i = 0x1040c108;
int *p = (int*)i; // compiles

but why can't I do this in Go?

addr := 0x1040c108
p := (*int)(addr) // Error: cannot convert addr (type int) to type *int

What is the way to achieve this in golang ??

Answer 1

Go through the unsafe package. Please note that it is called "unsafe" for a reason and probably shouldn't be used unless you REALLY need to do operations that bypass type safeties, or operate on memory directly.

https://play.golang.org/p/WUavNAlyVP

package main

import (
    "fmt"
    "unsafe"
)

func main() {
    fmt.Println("Hello, playground")
    var intaddr int = 0x1040c108
    var addr uintptr = uintptr(intaddr)
    ptr := unsafe.Pointer(addr)
    p := (*int)(ptr)
    fmt.Printf("Type: %T, Ptr: %v, Val: %d", p, p, *p)
}