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hash-map-tests.c (test_map_of_strings_to_int): Show how to use string contents as hash_map keys.

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* hash-map-tests.c (test_map_of_strings_to_int): Show how to use
	string contents as hash_map keys.

From-SVN: r268121
This commit is contained in:
Michael Ploujnikov 2019-01-21 19:04:04 +00:00 committed by Michael Ploujnikov
parent 9011fa06de
commit 3b1f091c4b
2 changed files with 25 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2019-01-21 Michael Ploujnikov <michael.ploujnikov@oracle.com>
* hash-map-tests.c (test_map_of_strings_to_int): Show how to use
string contents as hash_map keys.
2019-01-21 Bernd Edlinger <bernd.edlinger@hotmail.de>
PR c/88928

20
gcc/hash-map-tests.c
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@ -77,6 +77,26 @@ test_map_of_strings_to_int ()
m.remove (eric);
ASSERT_EQ (5, m.elements ());
ASSERT_EQ (NULL, m.get (eric));
/* A plain char * key is hashed based on its value (address), rather
than the string it points to. */
char *another_ant = static_cast <char *> (xcalloc (4, 1));
another_ant[0] = 'a';
another_ant[1] = 'n';
another_ant[2] = 't';
another_ant[3] = 0;
ASSERT_NE (ant, another_ant);
unsigned prev_size = m.elements ();
ASSERT_EQ (false, m.put (another_ant, 7));
ASSERT_EQ (prev_size + 1, m.elements ());
/* Need to use string_hash or nofree_string_hash key types to hash
based on the string contents. */
hash_map <nofree_string_hash, int> string_map;
ASSERT_EQ (false, string_map.put (ant, 1));
ASSERT_EQ (1, string_map.elements ());
ASSERT_EQ (true, string_map.put (another_ant, 5));
ASSERT_EQ (1, string_map.elements ());
}
/* Run all of the selftests within this file. */