Documentation Source Text: Check-in [ed402895f8]

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Overview

Comment:	Add a link to example geometry callback code to rtree.in.
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SHA1:	ed402895f82ec529c3b03ccadb8a13da5cb2a912
User & Date:	dan 2010-08-31 15:03:14

Context

2010-08-31
15:53		Expand the description of the large-transaction limitatioo for WAL mode. Identify additional requirements in the second file format document. (check-in: 400de5a3af user: drh tags: trunk)
15:03		Add a link to example geometry callback code to rtree.in. (check-in: ed402895f8 user: dan tags: trunk)
11:01		Add documentation for custom r-tree geometry callbacks to rtree.in (check-in: 7e421e2c51 user: dan tags: trunk)

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Changes to pages/rtree.in.

invocations of the callback within the same custom r-tree query (for example, a
pointer to a complicated data structure used to test for region intersection).
If the xDelUser variable is set to a non-NULL value, then after the custom
r-tree query has finished running SQLite automatically invokes it with the
value of the pUser variable as the only argument. In other words, xDelUser
may be set to a destructor function for the pUser value.








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invocations of the callback within the same custom r-tree query (for example, a
pointer to a complicated data structure used to test for region intersection).
If the xDelUser variable is set to a non-NULL value, then after the custom
r-tree query has finished running SQLite automatically invokes it with the
value of the pUser variable as the only argument. In other words, xDelUser
may be set to a destructor function for the pUser value.

<p>Example code implementing the "circle" r-tree geometry callback may be
found in the file 
<a href=http://www.sqlite.org/src/doc/trunk/src/test_rtree.c>test_rtree.c</a>.