Re: How unsafe are unsafeThawArray# and unsafeFreezeArray#

On 2012-03-09 02:13, Johan Tibell wrote:

Hi,

I just ran across some code that calls unsafeThawArray#, writeArray#, and unsafeFreezeArray#, in that order. How unsafe is that?

Quick follow up question: Are unsafeThawArray# and unsafeFreezeArray# guaranteed to not make a copy? I.e. are these two pieces of code equivalent with respect to further usage of the return value: do mary <- unsafeThawArray# ary writeArray# mary 123# newValue unsafeFreezeArray# mary and do mary <- unsafeThawArray# ary writeArray# mary 123# newValue return ary (where do notation is actually done manually.) Twan