!PRODUCT vs ASSERT?

[Thomas Stüfe]

Hi all,

a short and maybe stupid question, what is the precise difference between:

#ifndef PRODUCT

vs

#ifdef ASSERT

?

I assume:

optimized: !PRODUCT && !ASSERT
xxxdebug: !PRODUCT && ASSERT
release:     PRODUCT && !ASSERT

is this true?

Also, when guarding pieces of performance-costly sanity checks, which one
should be used?

(I see both used sometimes. For example, MetaChunk::mangle() implementation
is guarded by !PRODUCT but its call is guarded once by ASSERT, once by
!PRODUCT, is that deliberate?)

Thanks, Thomas