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structgosizeof

Sizeof struct in Go

I'm having a look at Go, which looks quite promising. I am trying to figure out how to get the size of a go struct, for example something like

type Coord3d struct {
    X, Y, Z int64
}

Of course I know that it's 24 bytes, but I'd like to know it programmatically..

Do you have any ideas how to do this ?

Solution 
  • import unsafe "unsafe"

/* Structure describing an inotify event.  */
type INotifyInfo struct {
    Wd     int32  // Watch descriptor
    Mask   uint32 // Watch mask
    Cookie uint32 // Cookie to synchronize two events
    Len    uint32 // Length (including NULs) of name
}

func doSomething() {
    var info INotifyInfo
    const infoSize = unsafe.Sizeof(info)
    ...
}

    NOTE: The OP is mistaken. The unsafe.Sizeof does return 24 on the example Coord3d struct. See comment below.