Mastering Go - Second Edition

About the unsafe package

Now you have seen the unsafe package in action, it is a good time to talk more about what makes it a special kind of package. First of all, if you look at the source code of the unsafe package, you might be a little surprised. On a macOS Mojave system with Go version 1.11.4 that is installed using Homebrew (https://brew.sh/), the source code of the unsafe package is located at /usr/local/Cellar/go/1.11.4/libexec/src/unsafe/unsafe.go and its contents without the comments are the following:

$ cd /usr/local/Cellar/go/1.11.4/libexec/src/unsafe/
$ grep  -v '^//' unsafe.go | grep -v '^$'
package unsafe
type ArbitraryType int
type Pointer *ArbitraryType
func Sizeof(x ArbitraryType) uintptr
func Offsetof(x ArbitraryType) uintptr ...