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56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
/*
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/IntegralMath.h>
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#include <initializer_list>
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TEST_CASE(pow)
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{
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EXPECT_EQ(AK::pow<u64>(10, 0), 1ull);
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EXPECT_EQ(AK::pow<u64>(10, 1), 10ull);
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EXPECT_EQ(AK::pow<u64>(10, 2), 100ull);
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EXPECT_EQ(AK::pow<u64>(10, 3), 1'000ull);
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EXPECT_EQ(AK::pow<u64>(10, 4), 10'000ull);
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EXPECT_EQ(AK::pow<u64>(10, 5), 100'000ull);
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EXPECT_EQ(AK::pow<u64>(10, 6), 1'000'000ull);
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}
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TEST_CASE(is_power_of)
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{
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constexpr auto check_prime = []<u64 prime>(u64 limit) {
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for (u64 power = 0; power < limit; ++power)
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EXPECT(AK::is_power_of<prime>(AK::pow(prime, power)));
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};
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// Limits calculated as floor( log_{prime}(2^64) ) to prevent overflows.
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check_prime.operator()<2>(64);
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check_prime.operator()<3>(40);
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check_prime.operator()<5>(27);
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check_prime.operator()<7>(20);
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check_prime.operator()<11>(18);
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check_prime.operator()<97>(9);
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check_prime.operator()<257>(7);
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}
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TEST_CASE(exp2)
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{
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EXPECT_EQ(AK::exp2<u64>(0), 1ull);
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EXPECT_EQ(AK::exp2<u64>(1), 2ull);
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EXPECT_EQ(AK::exp2<i8>(6), 64);
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EXPECT_EQ(AK::exp2<u8>(7), 128);
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EXPECT_EQ(AK::exp2<u16>(9), 512);
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EXPECT_EQ(AK::exp2<i16>(14), 16384);
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EXPECT_EQ(AK::exp2<u16>(15), 32768);
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EXPECT_EQ(AK::exp2<u32>(17), 131072u);
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EXPECT_EQ(AK::exp2<i32>(30), 1073741824);
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EXPECT_EQ(AK::exp2<u32>(31), 2147483648);
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EXPECT_EQ(AK::exp2<i64>(32), 4294967296);
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EXPECT_EQ(AK::exp2<u64>(33), 8589934592ull);
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EXPECT_EQ(AK::exp2<i64>(62), 4611686018427387904);
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EXPECT_EQ(AK::exp2<u64>(63), 9223372036854775808ull);
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}
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