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18a40587ea
Problem: - Hash functions can be `constexpr`, but are not. Solution: - Change `inline` keyword to `constexpr`. - Add `static_assert` tests to ensure the hash functions work in a `constexpr` context.
84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/TestSuite.h>
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#include <AK/HashFunctions.h>
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#include <AK/Types.h>
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TEST_CASE(int_hash)
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{
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static_assert(int_hash(42) == 3564735745u);
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static_assert(int_hash(0) == 1177991625u);
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}
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TEST_CASE(double_hash)
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{
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static_assert(double_hash(42) == 524450u);
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static_assert(double_hash(0) == 12384u);
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}
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TEST_CASE(pair_int_hash)
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{
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static_assert(pair_int_hash(42, 17) == 339337046u);
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static_assert(pair_int_hash(0, 0) == 954888656u);
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}
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TEST_CASE(u64_hash)
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{
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static_assert(u64_hash(42) == 2824066580u);
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static_assert(u64_hash(0) == 954888656u);
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}
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TEST_CASE(ptr_hash)
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{
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// These tests are not static_asserts because the values are
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// different and the goal is to bind the behavior.
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if constexpr (sizeof(FlatPtr) == 8) {
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EXPECT_EQ(ptr_hash(FlatPtr(42)), 2824066580u);
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EXPECT_EQ(ptr_hash(FlatPtr(0)), 954888656u);
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EXPECT_EQ(ptr_hash(reinterpret_cast<const void*>(42)), 2824066580u);
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EXPECT_EQ(ptr_hash(reinterpret_cast<const void*>(0)), 954888656u);
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} else {
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EXPECT_EQ(ptr_hash(FlatPtr(42)), 3564735745u);
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EXPECT_EQ(ptr_hash(FlatPtr(0)), 1177991625u);
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EXPECT_EQ(ptr_hash(reinterpret_cast<const void*>(42)), 3564735745u);
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EXPECT_EQ(ptr_hash(reinterpret_cast<const void*>(0)), 1177991625u);
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}
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}
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TEST_CASE(constexpr_ptr_hash)
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{
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// This test does not check the result because the goal is just to
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// ensure the function can be executed in a constexpr context. The
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// "ptr_hash" test binds the result.
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static_assert(ptr_hash(FlatPtr(42)));
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}
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TEST_MAIN(HashFunctions)
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