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define: DUK_OPT_EXTSTR_FREE
introduced: 1.1.0
requires:
- DUK_OPT_EXTERNAL_STRINGS
tags:
- memory
- experimental
description: >
Optional counterpart to DUK_OPT_EXTSTR_INTERN_CHECK. Invoked when an
external string is about to be freed by Duktape.
The argument "ptr" is a void ptr and points to the external string data.
Concretely, it is the (non-NULL) value returned by
DUK_OPT_EXTSTR_INTERN_CHECK. The "udata" argument is the heap userdata
which may be ignored if not needed.
Also enable DUK_OPT_EXTERNAL_STRINGS to use this feature.
NOTE: Right now there is no API to push external strings; external strings
come into being as a result of DUK_OPT_EXTSTR_INTERN_CHECK() only. If/when
this is changed, this hook will get called for every string, even if pushed
by the user using an API call; this may need to be rethought at that time.