个人认为golang语言的传值和传指针和C类似，不管是传值或者是传指针，都可以统称传值。（指针的地址也是值）

官方文档：

>In a function call, the function value and arguments are evaluated in the usual order. After they are evaluated, the parameters of the call are passed by value to the function and the called function begins execution. The return parameters of the function are passed by value back to the calling function when the function returns.

至于golang的三种引用类型slice,channel,map，因为结构里面包含指针 slice 结构(runtime包下)

type slice struct {
    array unsafe.Pointer
    len   int
    cap   int
}

chan 结构（runtime包下）

type hchan struct {
    qcount   uint           // total data in the queue
    dataqsiz uint           // size of the circular queue
    buf      unsafe.Pointer // points to an array of dataqsiz elements
    elemsize uint16
    closed   uint32
    elemtype *_type // element type
    sendx    uint   // send index
    recvx    uint   // receive index
    recvq    waitq  // list of recv waiters
    sendq    waitq  // list of send waiters

    // lock protects all fields in hchan, as well as several
    // fields in sudogs blocked on this channel.
    //
    // Do not change another G's status while holding this lock
    // (in particular, do not ready a G), as this can deadlock
    // with stack shrinking.
    lock mutex
}

map 结构（runtime包下）

// A header for a Go map.
type hmap struct {
    // Note: the format of the Hmap is encoded in ../../cmd/internal/gc/reflect.go and
    // ../reflect/type.go. Don't change this structure without also changing that code!
    count     int // # live cells == size of map.  Must be first (used by len() builtin)
    flags     uint8
    B         uint8  // log_2 of # of buckets (can hold up to loadFactor * 2^B items)
    noverflow uint16 // approximate number of overflow buckets; see incrnoverflow for details
    hash0     uint32 // hash seed

    buckets    unsafe.Pointer // array of 2^B Buckets. may be nil if count==0.
    oldbuckets unsafe.Pointer // previous bucket array of half the size, non-nil only when growing
    nevacuate  uintptr        // progress counter for evacuation (buckets less than this have been evacuated)

    extra *mapextra // optional fields
}

不能随便相信别人的结论，需要自己动脑去思考，去实践 http://blog.csdn.net/future_challenger/article/details/48438017 比如这篇文章，里面有些错误信息(经过仔细思考后有些认为是错误的)