From 3b1f091c4b6881cd60f6f37c31b0054e04d137cc Mon Sep 17 00:00:00 2001 From: Michael Ploujnikov Date: Mon, 21 Jan 2019 19:04:04 +0000 Subject: [PATCH] hash-map-tests.c (test_map_of_strings_to_int): Show how to use string contents as hash_map keys. * hash-map-tests.c (test_map_of_strings_to_int): Show how to use string contents as hash_map keys. From-SVN: r268121 --- gcc/ChangeLog | 5 +++++ gcc/hash-map-tests.c | 20 ++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ff92634df4d..5ca20aed5da 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2019-01-21 Michael Ploujnikov + + * 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 PR c/88928 diff --git a/gcc/hash-map-tests.c b/gcc/hash-map-tests.c index 7b7a1c89045..2137464e693 100644 --- a/gcc/hash-map-tests.c +++ b/gcc/hash-map-tests.c @@ -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 (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 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. */