is BytesMut based on ringbuffer?

[notgull]

No, it's basically a Vec.

[ghost]

but it looks like a queue a vec looks like a stacke

[ghost]

why the bytes in BytesMut not move when i call get_u8() if its a vec

[Darksonn]

A BytesMut has a starting position too, so it can increment the starting position. It's not a ring buffer because it doesn't "wrap around" when you reach the end. The bytes are always stored contiguously.