зеркало из https://github.com/mozilla/gecko-dev.git
104 строки
4.3 KiB
C++
104 строки
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/MathAlgorithms.h"
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#include <stdint.h>
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using mozilla::Clamp;
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using mozilla::IsPowerOfTwo;
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static void TestClamp() {
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MOZ_RELEASE_ASSERT(Clamp(0, 0, 0) == 0);
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MOZ_RELEASE_ASSERT(Clamp(1, 0, 0) == 0);
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MOZ_RELEASE_ASSERT(Clamp(-1, 0, 0) == 0);
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MOZ_RELEASE_ASSERT(Clamp(0, 1, 1) == 1);
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MOZ_RELEASE_ASSERT(Clamp(0, 1, 2) == 1);
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MOZ_RELEASE_ASSERT(Clamp(0, -1, -1) == -1);
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MOZ_RELEASE_ASSERT(Clamp(0, -2, -1) == -1);
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MOZ_RELEASE_ASSERT(Clamp(0, 1, 3) == 1);
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MOZ_RELEASE_ASSERT(Clamp(1, 1, 3) == 1);
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MOZ_RELEASE_ASSERT(Clamp(2, 1, 3) == 2);
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MOZ_RELEASE_ASSERT(Clamp(3, 1, 3) == 3);
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MOZ_RELEASE_ASSERT(Clamp(4, 1, 3) == 3);
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MOZ_RELEASE_ASSERT(Clamp(5, 1, 3) == 3);
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MOZ_RELEASE_ASSERT(Clamp<uint8_t>(UINT8_MAX, 0, UINT8_MAX) == UINT8_MAX);
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MOZ_RELEASE_ASSERT(Clamp<uint8_t>(0, 0, UINT8_MAX) == 0);
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MOZ_RELEASE_ASSERT(Clamp<int8_t>(INT8_MIN, INT8_MIN, INT8_MAX) == INT8_MIN);
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MOZ_RELEASE_ASSERT(Clamp<int8_t>(INT8_MIN, 0, INT8_MAX) == 0);
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MOZ_RELEASE_ASSERT(Clamp<int8_t>(INT8_MAX, INT8_MIN, INT8_MAX) == INT8_MAX);
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MOZ_RELEASE_ASSERT(Clamp<int8_t>(INT8_MAX, INT8_MIN, 0) == 0);
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}
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static void TestIsPowerOfTwo() {
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static_assert(!IsPowerOfTwo(0u), "0 isn't a power of two");
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static_assert(IsPowerOfTwo(1u), "1 is a power of two");
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static_assert(IsPowerOfTwo(2u), "2 is a power of two");
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static_assert(!IsPowerOfTwo(3u), "3 isn't a power of two");
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static_assert(IsPowerOfTwo(4u), "4 is a power of two");
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static_assert(!IsPowerOfTwo(5u), "5 isn't a power of two");
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static_assert(!IsPowerOfTwo(6u), "6 isn't a power of two");
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static_assert(!IsPowerOfTwo(7u), "7 isn't a power of two");
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static_assert(IsPowerOfTwo(8u), "8 is a power of two");
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static_assert(!IsPowerOfTwo(9u), "9 isn't a power of two");
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static_assert(!IsPowerOfTwo(uint8_t(UINT8_MAX / 2)),
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"127, 0x7f isn't a power of two");
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static_assert(IsPowerOfTwo(uint8_t(UINT8_MAX / 2 + 1)),
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"128, 0x80 is a power of two");
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static_assert(!IsPowerOfTwo(uint8_t(UINT8_MAX / 2 + 2)),
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"129, 0x81 isn't a power of two");
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static_assert(!IsPowerOfTwo(uint8_t(UINT8_MAX - 1)),
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"254, 0xfe isn't a power of two");
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static_assert(!IsPowerOfTwo(uint8_t(UINT8_MAX)),
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"255, 0xff isn't a power of two");
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static_assert(!IsPowerOfTwo(uint16_t(UINT16_MAX / 2)),
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"0x7fff isn't a power of two");
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static_assert(IsPowerOfTwo(uint16_t(UINT16_MAX / 2 + 1)),
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"0x8000 is a power of two");
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static_assert(!IsPowerOfTwo(uint16_t(UINT16_MAX / 2 + 2)),
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"0x8001 isn't a power of two");
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static_assert(!IsPowerOfTwo(uint16_t(UINT16_MAX - 1)),
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"0xfffe isn't a power of two");
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static_assert(!IsPowerOfTwo(uint16_t(UINT16_MAX)),
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"0xffff isn't a power of two");
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static_assert(!IsPowerOfTwo(uint32_t(UINT32_MAX / 2)),
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"0x7fffffff isn't a power of two");
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static_assert(IsPowerOfTwo(uint32_t(UINT32_MAX / 2 + 1)),
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"0x80000000 is a power of two");
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static_assert(!IsPowerOfTwo(uint32_t(UINT32_MAX / 2 + 2)),
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"0x80000001 isn't a power of two");
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static_assert(!IsPowerOfTwo(uint32_t(UINT32_MAX - 1)),
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"0xfffffffe isn't a power of two");
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static_assert(!IsPowerOfTwo(uint32_t(UINT32_MAX)),
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"0xffffffff isn't a power of two");
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static_assert(!IsPowerOfTwo(uint64_t(UINT64_MAX / 2)),
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"0x7fffffffffffffff isn't a power of two");
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static_assert(IsPowerOfTwo(uint64_t(UINT64_MAX / 2 + 1)),
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"0x8000000000000000 is a power of two");
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static_assert(!IsPowerOfTwo(uint64_t(UINT64_MAX / 2 + 2)),
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"0x8000000000000001 isn't a power of two");
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static_assert(!IsPowerOfTwo(uint64_t(UINT64_MAX - 1)),
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"0xfffffffffffffffe isn't a power of two");
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static_assert(!IsPowerOfTwo(uint64_t(UINT64_MAX)),
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"0xffffffffffffffff isn't a power of two");
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}
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int main() {
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TestIsPowerOfTwo();
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TestClamp();
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return 0;
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}
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