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794e86b99d
This simplifies determining what the byte size of the template type is, so we can write a specific implementation for 32 and 64 bit seeds for hash_combine. Change-Id: Icd68e4618151957ecc00585dd521adf11fe3931a Reviewed-on: https://gerrit.libreoffice.org/c/core/+/182266 Tested-by: Jenkins Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*/
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#include <cppunit/TestAssert.h>
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#include <cppunit/TestFixture.h>
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#include <cppunit/extensions/HelperMacros.h>
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#include <sal/types.h>
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#include <rtl/ustring.hxx>
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#include <o3tl/hash_combine.hxx>
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namespace
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{
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struct TestStruct
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{
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};
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class HashCombineTest : public CppUnit::TestFixture
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{
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public:
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void testBaseUsage()
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{
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TestStruct objectA;
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TestStruct objectB;
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{
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sal_uInt64 seed(0);
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o3tl::hash_combine(seed, OUString("Hmm-.."));
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o3tl::hash_combine(seed, 24);
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o3tl::hash_combine(seed, 42u);
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o3tl::hash_combine(seed, 5.1);
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o3tl::hash_combine(seed, &objectA);
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o3tl::hash_combine(seed, &objectB);
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CPPUNIT_ASSERT(seed != sal_uInt64(0));
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static_assert(sizeof(seed) == 8);
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}
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{
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sal_uInt32 seed(0);
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o3tl::hash_combine(seed, OUString("Hmm-.."));
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o3tl::hash_combine(seed, 24);
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o3tl::hash_combine(seed, 42u);
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o3tl::hash_combine(seed, 5.1);
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o3tl::hash_combine(seed, &objectA);
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o3tl::hash_combine(seed, &objectB);
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CPPUNIT_ASSERT(seed != sal_uInt32(0));
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static_assert(sizeof(seed) == 4);
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}
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// No assert of the actual value - we just check this compiles and runs. Hash algorithm is probably
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// also implementation specific.
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// Using sal_uInt16 for seed doesn't compile as there is not compatible hash_combine override for seed that is 16 bit.
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}
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CPPUNIT_TEST_SUITE(HashCombineTest);
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CPPUNIT_TEST(testBaseUsage);
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CPPUNIT_TEST_SUITE_END();
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};
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}
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CPPUNIT_TEST_SUITE_REGISTRATION(HashCombineTest);
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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