[erlang-questions] binary_part/3

[Alex Alvarez]

Okay, maybe I'm totally confused here, but is it a pointer to the
original binary or a new binary?  Looking at the source code it seems
to build/make a new binary at the end of erts_gc_binary_part().  And
from the shell...

1> A = .

2> B = erlang:binary_part(A, 0, 8).

3> f(A).
ok
4> B.
A is gone and we still have B.  Does Erlang actually returns
references?

Cheers,
Alex

On 1/7/2018 at 1:21 PM, "Frank Muller"  wrote:Thank you Roger!!!
It's a sub-binary:
 https://github.com/erlang/otp/blob/master/erts/emulator/beam/erl_bif_binary.c#L1915-L1924
 On 6 January 2018 at 21:38, Frank Muller  wrote:
 > Hi Everyone
 >
 > Is the binary returned when calling binary_part/3:
 > 1.  a sub-binary pointing to the original one
 > 2. or a new binary
 >
 > Thank you.
 > Frank
 >
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