转换切片的字节而不复制[重复]

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• Convert between slices of different types 7 answers

How to convert a slice of bytes to []uint16 and reverse without allocation new uint16 slice. This question focused on performance and memory consumption

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Answer 1

Consider that converting = copying, except for two special cases: m:=map[string]int{};m[string(bytes)) has no allocation, similarly with append.

Using unsafe.Pointer seems the current workaround (as its name suggests, "unsafe")

u16 := *(*uint16)(unsafe.Pointer(&byte_array[4]))

There is a proposal to use unsafe.Slice instead.
There is also the (rejected for now) proposal golang/go issue 13656

The problem is having to write (*[C]T)(unsafe.Pointer(v))[:n:n], for some C, T, v, and n.

A simpler way to write that entire expression would be ideal.

var s []byte = C.AsSlice((*byte)(ptr), n)