unsafe.Pointer称为通用指针,官方文档对该类型有四个重要描述:
(1)任何类型的指针都可以被转化为Pointer
(2)Pointer可以被转化为任何类型的指针
(3)uintptr可以被转化为Pointer
(4)Pointer可以被转化为uintptr
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package main
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import (
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"fmt"
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"unsafe"
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)
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func main(){
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a := [4]int{1,2,3,4}
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p1 := unsafe.Pointer(&a)
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p2 := uintptr(p1)
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p3 := p2 + 1 * unsafe.Sizeof(p1)
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p4 := (*int)(unsafe.Pointer(p3))
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*p4 = 8
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fmt.Printf("%p %p %d %d %v \n",&a,p1,p2,unsafe.Sizeof(p1),a)
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}
输出:
0xc000060140 0xc000060140 824634114368 8 [1 8 3 4]
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