Usually you don't need Buffer. You're need pointer to internal array data right? In this case Array and TypedArray provide dataStart field

But they are private, although the private modifier is currently invalid, but I hope that a public field can do this (and is documented), dataStart is also private

But they are private, although the private modifier is currently invalid, but I hope that a public field can do this (and is documented), dataStart is also private

"dataStart" is public but unsafe.

basically all FFI interfaces which use AssemblyScript (Fastly/lucet, NEAR/wasmer and just standard WASI) use dataStart

For example:
https://github.com/jedisct1/as-wasi/blob/master/assembly/as-wasi.ts#L295

For example:
https://github.com/jedisct1/as-wasi/blob/master/assembly/as-wasi.ts#L295

Do you mean always changetype first?

Do you mean always changetype first?

Basically you could mimic Array to ArrayBufferView and got access to dataStart as changetype<ArrayBufferView>(array).dataStart

Do you mean always changetype first?

Basically you could mimic Array to ArrayBufferView and got access to dataStart as changetype<ArrayBufferView>(array).dataStart

Well, I have a new question now. What is the point of storing both buffer and dataStart in ArrayBufferView? dataStart is equivalent to buffer everywhere. Sorry, what's the meaning of this value?

Well, I have a new question now. What is the point of storing both buffer and dataStart in ArrayBufferView? dataStart is equivalent to buffer everywhere. Sorry, what's the meaning of this value?

ArrayBufferView is basic class for TypedArray which have also byteOffset so dataStart provide fast access and equivalent to changetype<usize>(typedArr.buffer) + typedArr.byteOffset

Well, it seems that the reason is quite complicated

Do you mean always changetype first?

Basically you could mimic Array to ArrayBufferView and got access to dataStart as changetype<ArrayBufferView>(array).dataStart

let data_buf_in = changetype<ArrayBufferView>(data).dataStart;

dataStart should be documented in index.d.ts and website.

dataStart now public in Array after #1828