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author | Davide Italiano <davide.italiano@10gen.com> | 2014-01-03 16:00:17 -0800 |
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committer | Davide Italiano <davide.italiano@10gen.com> | 2014-01-03 16:00:17 -0800 |
commit | 22424987d2f0df32671998f0c7574adcfa07bf32 (patch) | |
tree | 6b46a5fb6f98bbed50c999ab5af4493829791875 /src/mongo/base/string_data_test.cpp | |
parent | fdcaa37f78789c4bdedac8fd98c0fdfc517fb978 (diff) | |
download | mongo-22424987d2f0df32671998f0c7574adcfa07bf32.tar.gz |
SERVER-12157 Replace implementation of StringMapDefaultHash::operator()
with Murmur3. This has proven to be more effective in terms of speed
and collision rates.
Diffstat (limited to 'src/mongo/base/string_data_test.cpp')
-rw-r--r-- | src/mongo/base/string_data_test.cpp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/mongo/base/string_data_test.cpp b/src/mongo/base/string_data_test.cpp index 2ec32039aab..977d670079e 100644 --- a/src/mongo/base/string_data_test.cpp +++ b/src/mongo/base/string_data_test.cpp @@ -137,6 +137,42 @@ namespace { ASSERT_EQUALS( string("foo").find( "" ), StringData("foo").find( "" ) ); } + // Helper function for Test(Hasher, Str1) + template <int SizeofSizeT> + void SDHasher_check(void); + + template <> + void SDHasher_check<4>(void) { + ASSERT_EQUALS(StringData::Hasher()(""), + static_cast<size_t>(0)); + ASSERT_EQUALS(StringData::Hasher()("foo"), + static_cast<size_t>(4138058784)); + ASSERT_EQUALS(StringData::Hasher()("pizza"), + static_cast<size_t>(3587803311)); + ASSERT_EQUALS(StringData::Hasher()("mongo"), + static_cast<size_t>(3724335885)); + ASSERT_EQUALS(StringData::Hasher()("murmur"), + static_cast<size_t>(1945310157)); + } + + template <> + void SDHasher_check<8>(void) { + ASSERT_EQUALS(StringData::Hasher()(""), + static_cast<size_t>(0)); + ASSERT_EQUALS(StringData::Hasher()("foo"), + static_cast<size_t>(16316970633193145697UL)); + ASSERT_EQUALS(StringData::Hasher()("pizza"), + static_cast<size_t>(12165495155477134356UL)); + ASSERT_EQUALS(StringData::Hasher()("mongo"), + static_cast<size_t>(2861051452199491487UL)); + ASSERT_EQUALS(StringData::Hasher()("murmur"), + static_cast<size_t>(18237957392784716687UL)); + } + + TEST(Hasher, Str1) { + SDHasher_check<sizeof(size_t)>(); + } + TEST(Rfind, Char1) { ASSERT_EQUALS( string::npos, StringData( "foo" ).rfind( 'a' ) ); |