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define: DUK_USE_DATAPTR_ENC16
introduced: 1.1.0
requires:
- DUK_USE_DATAPTR16
default: false
tags:
- lowmemory
- experimental
description: >
Use together with DUK_USE_DATAPTR16 for arbitrary data pointer compression.
DUK_USE_DATAPTR_ENC16(udata,p) is a macro with a userdata and void ptr
argument, and a duk_uint16_t return value. The userdata argument is the
heap userdata value given at heap creation. Currently it is required that
NULL encodes to integer 0, and integer 0 decodes to NULL. No other pointer
can be encoded to 0.