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Add documentation to "dcompact" callback and "parent" member

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This commit is contained in:
Lars Kanis 2020-08-06 22:37:01 +02:00 • committed by Aaron Patterson
parent 326d89b7ce
commit 92b2d5816a
Notes: git 2020-08-26 02:51:15 +09:00
1 changed files with 11 additions and 2 deletions
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13
doc/extension.rdoc
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@ -676,7 +676,8 @@ member of the struct.
void (*dmark)(void*);
void (*dfree)(void*);
size_t (*dsize)(const void *);
void *reserved[2];
void (*dcompact)(void*);
void *reserved[1];
} function;
const rb_data_type_t *parent;
void *data;
@ -708,7 +709,15 @@ Its parameter is a pointer to your struct.
You can pass 0 as dsize if it is hard to implement such a function.
But it is still recommended to avoid 0.
You have to fill reserved and parent with 0.
dcompact is invoked when memory compaction took place.
Referred Ruby objects that were marked by rb_gc_mark_movable()
can here be updated per rb_gc_location().
You have to fill reserved with 0.
parent can point to another C type definition that the Ruby object
is inherited from. Then TypedData_Get_Struct() does also accept
derived objects.
You can fill "data" with an arbitrary value for your use.
Ruby does nothing with the member.