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<body class="article">
<div id="header">
<h1>oid-array API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>The oid-array API provides storage and manipulation of sets of object
identifiers. The emphasis is on storage and processing efficiency,
making them suitable for large lists. Note that the ordering of items is
not preserved over some operations.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_data_structures">Data Structures</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<code>struct oid_array</code>
</dt>
<dd>
<p>
A single array of object IDs. This should be initialized by
assignment from <code>OID_ARRAY_INIT</code>. The <code>oid</code> member contains
the actual data. The <code>nr</code> member contains the number of items in
the set. The <code>alloc</code> and <code>sorted</code> members are used internally,
and should not be needed by API callers.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_functions">Functions</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<code>oid_array_append</code>
</dt>
<dd>
<p>
Add an item to the set. The object ID will be placed at the end of
the array (but note that some operations below may lose this
ordering).
</p>
</dd>
<dt class="hdlist1">
<code>oid_array_lookup</code>
</dt>
<dd>
<p>
Perform a binary search of the array for a specific object ID.
If found, returns the offset (in number of elements) of the
object ID. If not found, returns a negative integer. If the array
is not sorted, this function has the side effect of sorting it.
</p>
</dd>
<dt class="hdlist1">
<code>oid_array_clear</code>
</dt>
<dd>
<p>
Free all memory associated with the array and return it to the
initial, empty state.
</p>
</dd>
<dt class="hdlist1">
<code>oid_array_for_each</code>
</dt>
<dd>
<p>
Iterate over each element of the list, executing the callback
function for each one. Does not sort the list, so any custom
hash order is retained. If the callback returns a non-zero
value, the iteration ends immediately and the callback&#8217;s
return is propagated; otherwise, 0 is returned.
</p>
</dd>
<dt class="hdlist1">
<code>oid_array_for_each_unique</code>
</dt>
<dd>
<p>
Iterate over each unique element of the list in sorted order,
but otherwise behave like <code>oid_array_for_each</code>. If the array
is not sorted, this function has the side effect of sorting
it.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">Examples</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre><code>int print_callback(const struct object_id *oid,
void *data)
{
printf("%s\n", oid_to_hex(oid));
return 0; /* always continue */
}
void some_func(void)
{
struct sha1_array hashes = OID_ARRAY_INIT;
struct object_id oid;
/* Read objects into our set */
while (read_object_from_stdin(oid.hash))
oid_array_append(&amp;hashes, &amp;oid);
/* Check if some objects are in our set */
while (read_object_from_stdin(oid.hash)) {
if (oid_array_lookup(&amp;hashes, &amp;oid) &gt;= 0)
printf("it's in there!\n");
/*
* Print the unique set of objects. We could also have
* avoided adding duplicate objects in the first place,
* but we would end up re-sorting the array repeatedly.
* Instead, this will sort once and then skip duplicates
* in linear time.
*/
oid_array_for_each_unique(&amp;hashes, print_callback, NULL);
}</code></pre>
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Last updated
2018-05-30 15:32:39 JST
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