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Utilities - Hash combining helper

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This commit is contained in:
Emmanuel BENOîT 2020-09-26 10:37:13 +02:00
parent 90cf63c592
commit 3889efde67
3 changed files with 35 additions and 0 deletions

12
tests/hash-functions.cc
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@ -13,6 +13,7 @@ class ComputeHashTest : public CppUnit::TestFixture
CPPUNIT_TEST( testInt32 );
CPPUNIT_TEST( testInt64 );
CPPUNIT_TEST( testStructDefault );
CPPUNIT_TEST( testPair );
CPPUNIT_TEST_SUITE_END( );
public:
@ -21,6 +22,7 @@ public:
void testInt32( );
void testInt64( );
void testStructDefault( );
void testPair( );
};
@ -74,3 +76,13 @@ void ComputeHashTest::testStructDefault( )
CPPUNIT_ASSERT_EQUAL( uint32_t( HashData( test.meh , 16 ) ) ,
ComputeHash( test ) );
}
void ComputeHashTest::testPair( )
{
auto p{ std::make_pair< uint8_t , uint32_t >( 12 , 128 ) };
uint32_t hv = 0x9e3779b9 + 12;
hv = 128 + 0x9e3779b9 + ( hv << 6 ) + ( hv >> 2 );
CPPUNIT_ASSERT_EQUAL( hv , ComputeHash( p ) );
}