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Diffstat (limited to 'docs/nspr/reference/pl_hashtablelookup.rst')
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diff --git a/docs/nspr/reference/pl_hashtablelookup.rst b/docs/nspr/reference/pl_hashtablelookup.rst new file mode 100644 index 0000000000..236c08a874 --- /dev/null +++ b/docs/nspr/reference/pl_hashtablelookup.rst @@ -0,0 +1,45 @@ +PL_HashTableLookup +================== + +Looks up the entry with the specified key and return its value. + + +Syntax +------ + +.. code:: + + #include <plhash.h> + + void *PL_HashTableLookup( + PLHashTable *ht, + const void *key); + + +Parameters +~~~~~~~~~~ + +The function has the following parameters: + +``ht`` + A pointer to the hash table in which to look up the entry specified + by ``key``. +``key`` + A pointer to the key for the entry to look up. + + +Returns +~~~~~~~ + +The value of the entry with the specified key, or ``NULL`` if there is +no such entry. + + +Description +----------- + +If there is no entry with the specified key, :ref:`PL_HashTableLookup` +returns ``NULL``. This means that one cannot tell whether a ``NULL`` +return value means the entry does not exist or the value of the entry is +``NULL``. Keep this ambiguity in mind if you want to store ``NULL`` +values in a hash table. |