| /* |
| * Copyright 2017 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "rtc_base/numerics/safe_minmax.h" |
| |
| #include <algorithm> |
| #include <cstdint> |
| #include <limits> |
| #include <type_traits> |
| |
| #include "test/gtest.h" |
| |
| namespace rtc { |
| |
| namespace { |
| |
| // Functions that check that SafeMin(), SafeMax(), and SafeClamp() return the |
| // specified type. The functions that end in "R" use an explicitly given return |
| // type. |
| |
| template <typename T1, typename T2, typename Tmin, typename Tmax> |
| constexpr bool TypeCheckMinMax() { |
| return std::is_same<decltype(SafeMin(std::declval<T1>(), std::declval<T2>())), |
| Tmin>::value && |
| std::is_same<decltype(SafeMax(std::declval<T1>(), std::declval<T2>())), |
| Tmax>::value; |
| } |
| |
| template <typename T1, typename T2, typename R> |
| constexpr bool TypeCheckMinR() { |
| return std::is_same< |
| decltype(SafeMin<R>(std::declval<T1>(), std::declval<T2>())), R>::value; |
| } |
| |
| template <typename T1, typename T2, typename R> |
| constexpr bool TypeCheckMaxR() { |
| return std::is_same< |
| decltype(SafeMax<R>(std::declval<T1>(), std::declval<T2>())), R>::value; |
| } |
| |
| template <typename T, typename L, typename H, typename R> |
| constexpr bool TypeCheckClamp() { |
| return std::is_same<decltype(SafeClamp(std::declval<T>(), std::declval<L>(), |
| std::declval<H>())), |
| R>::value; |
| } |
| |
| template <typename T, typename L, typename H, typename R> |
| constexpr bool TypeCheckClampR() { |
| return std::is_same<decltype(SafeClamp<R>(std::declval<T>(), |
| std::declval<L>(), |
| std::declval<H>())), |
| R>::value; |
| } |
| |
| // clang-format off |
| |
| // SafeMin/SafeMax: Check that all combinations of signed/unsigned 8/64 bits |
| // give the correct default result type. |
| static_assert(TypeCheckMinMax< int8_t, int8_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckMinMax< int8_t, uint8_t, int8_t, uint8_t>(), ""); |
| static_assert(TypeCheckMinMax< int8_t, int64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckMinMax< int8_t, uint64_t, int8_t, uint64_t>(), ""); |
| static_assert(TypeCheckMinMax< uint8_t, int8_t, int8_t, uint8_t>(), ""); |
| static_assert(TypeCheckMinMax< uint8_t, uint8_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckMinMax< uint8_t, int64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckMinMax< uint8_t, uint64_t, uint8_t, uint64_t>(), ""); |
| static_assert(TypeCheckMinMax< int64_t, int8_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckMinMax< int64_t, uint8_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckMinMax< int64_t, int64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckMinMax< int64_t, uint64_t, int64_t, uint64_t>(), ""); |
| static_assert(TypeCheckMinMax<uint64_t, int8_t, int8_t, uint64_t>(), ""); |
| static_assert(TypeCheckMinMax<uint64_t, uint8_t, uint8_t, uint64_t>(), ""); |
| static_assert(TypeCheckMinMax<uint64_t, int64_t, int64_t, uint64_t>(), ""); |
| static_assert(TypeCheckMinMax<uint64_t, uint64_t, uint64_t, uint64_t>(), ""); |
| |
| // SafeClamp: Check that all combinations of signed/unsigned 8/64 bits give the |
| // correct result type. |
| static_assert(TypeCheckClamp< int8_t, int8_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, int8_t, uint8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, int8_t, int64_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, int8_t, uint64_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint8_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint8_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint8_t, int64_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint8_t, uint64_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, int64_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, int64_t, uint8_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, int64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, int64_t, uint64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint64_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint64_t, uint8_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int8_t, uint64_t, uint64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int8_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int8_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int8_t, int64_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int8_t, uint64_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint8_t, int8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint8_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint8_t, int64_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint8_t, uint64_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int64_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int64_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, int64_t, uint64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint64_t, int8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint64_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint64_t, int64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp< uint8_t, uint64_t, uint64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int8_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int8_t, uint8_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int8_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int8_t, uint64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint8_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint8_t, uint8_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint8_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint8_t, uint64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int64_t, int8_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int64_t, uint8_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, int64_t, uint64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint64_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint64_t, uint8_t, int16_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp< int64_t, uint64_t, uint64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int8_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int8_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int8_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int8_t, uint64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint8_t, int8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint8_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint8_t, int64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint8_t, uint64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int64_t, int8_t, int8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int64_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int64_t, int64_t, int64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, int64_t, uint64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint64_t, int8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint64_t, uint8_t, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint64_t, int64_t, uint64_t>(), ""); |
| static_assert(TypeCheckClamp<uint64_t, uint64_t, uint64_t, uint64_t>(), ""); |
| |
| enum DefaultE { kFoo = -17 }; |
| enum UInt8E : uint8_t { kBar = 17 }; |
| |
| // SafeMin/SafeMax: Check that we can use enum types. |
| static_assert(TypeCheckMinMax<unsigned, unsigned, unsigned, unsigned>(), ""); |
| static_assert(TypeCheckMinMax<unsigned, DefaultE, int, unsigned>(), ""); |
| static_assert(TypeCheckMinMax<unsigned, UInt8E, uint8_t, unsigned>(), ""); |
| static_assert(TypeCheckMinMax<DefaultE, unsigned, int, unsigned>(), ""); |
| static_assert(TypeCheckMinMax<DefaultE, DefaultE, int, int>(), ""); |
| static_assert(TypeCheckMinMax<DefaultE, UInt8E, int, int>(), ""); |
| static_assert(TypeCheckMinMax< UInt8E, unsigned, uint8_t, unsigned>(), ""); |
| static_assert(TypeCheckMinMax< UInt8E, DefaultE, int, int>(), ""); |
| static_assert(TypeCheckMinMax< UInt8E, UInt8E, uint8_t, uint8_t>(), ""); |
| |
| // SafeClamp: Check that we can use enum types. |
| static_assert(TypeCheckClamp<unsigned, unsigned, unsigned, unsigned>(), ""); |
| static_assert(TypeCheckClamp<unsigned, unsigned, DefaultE, unsigned>(), ""); |
| static_assert(TypeCheckClamp<unsigned, unsigned, UInt8E, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<unsigned, DefaultE, unsigned, unsigned>(), ""); |
| static_assert(TypeCheckClamp<unsigned, DefaultE, DefaultE, int>(), ""); |
| static_assert(TypeCheckClamp<unsigned, DefaultE, UInt8E, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<unsigned, UInt8E, unsigned, unsigned>(), ""); |
| static_assert(TypeCheckClamp<unsigned, UInt8E, DefaultE, unsigned>(), ""); |
| static_assert(TypeCheckClamp<unsigned, UInt8E, UInt8E, uint8_t>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, unsigned, unsigned, unsigned>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, unsigned, DefaultE, int>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, unsigned, UInt8E, int16_t>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, DefaultE, unsigned, int>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, DefaultE, DefaultE, int>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, DefaultE, UInt8E, int>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, UInt8E, unsigned, int>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, UInt8E, DefaultE, int>(), ""); |
| static_assert(TypeCheckClamp<DefaultE, UInt8E, UInt8E, int16_t>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, unsigned, unsigned, unsigned>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, unsigned, DefaultE, unsigned>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, unsigned, UInt8E, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, DefaultE, unsigned, unsigned>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, DefaultE, DefaultE, int>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, DefaultE, UInt8E, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, UInt8E, unsigned, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, UInt8E, DefaultE, uint8_t>(), ""); |
| static_assert(TypeCheckClamp< UInt8E, UInt8E, UInt8E, uint8_t>(), ""); |
| |
| using ld = long double; |
| |
| // SafeMin/SafeMax: Check that all floating-point combinations give the |
| // correct result type. |
| static_assert(TypeCheckMinMax< float, float, float, float>(), ""); |
| static_assert(TypeCheckMinMax< float, double, double, double>(), ""); |
| static_assert(TypeCheckMinMax< float, ld, ld, ld>(), ""); |
| static_assert(TypeCheckMinMax<double, float, double, double>(), ""); |
| static_assert(TypeCheckMinMax<double, double, double, double>(), ""); |
| static_assert(TypeCheckMinMax<double, ld, ld, ld>(), ""); |
| static_assert(TypeCheckMinMax< ld, float, ld, ld>(), ""); |
| static_assert(TypeCheckMinMax< ld, double, ld, ld>(), ""); |
| static_assert(TypeCheckMinMax< ld, ld, ld, ld>(), ""); |
| |
| // SafeClamp: Check that all floating-point combinations give the correct |
| // result type. |
| static_assert(TypeCheckClamp< float, float, float, float>(), ""); |
| static_assert(TypeCheckClamp< float, float, double, double>(), ""); |
| static_assert(TypeCheckClamp< float, float, ld, ld>(), ""); |
| static_assert(TypeCheckClamp< float, double, float, double>(), ""); |
| static_assert(TypeCheckClamp< float, double, double, double>(), ""); |
| static_assert(TypeCheckClamp< float, double, ld, ld>(), ""); |
| static_assert(TypeCheckClamp< float, ld, float, ld>(), ""); |
| static_assert(TypeCheckClamp< float, ld, double, ld>(), ""); |
| static_assert(TypeCheckClamp< float, ld, ld, ld>(), ""); |
| static_assert(TypeCheckClamp<double, float, float, double>(), ""); |
| static_assert(TypeCheckClamp<double, float, double, double>(), ""); |
| static_assert(TypeCheckClamp<double, float, ld, ld>(), ""); |
| static_assert(TypeCheckClamp<double, double, float, double>(), ""); |
| static_assert(TypeCheckClamp<double, double, double, double>(), ""); |
| static_assert(TypeCheckClamp<double, double, ld, ld>(), ""); |
| static_assert(TypeCheckClamp<double, ld, float, ld>(), ""); |
| static_assert(TypeCheckClamp<double, ld, double, ld>(), ""); |
| static_assert(TypeCheckClamp<double, ld, ld, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, float, float, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, float, double, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, float, ld, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, double, float, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, double, double, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, double, ld, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, ld, float, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, ld, double, ld>(), ""); |
| static_assert(TypeCheckClamp< ld, ld, ld, ld>(), ""); |
| |
| // clang-format on |
| |
| // SafeMin/SafeMax: Check some cases of explicitly specified return type. The |
| // commented-out lines give compilation errors due to the requested return type |
| // being too small or requiring an int<->float conversion. |
| static_assert(TypeCheckMinR<int8_t, int8_t, int16_t>(), ""); |
| // static_assert(TypeCheckMinR<int8_t, int8_t, float>(), ""); |
| static_assert(TypeCheckMinR<uint32_t, uint64_t, uint32_t>(), ""); |
| // static_assert(TypeCheckMaxR<uint64_t, float, float>(), ""); |
| // static_assert(TypeCheckMaxR<uint64_t, double, float>(), ""); |
| static_assert(TypeCheckMaxR<uint32_t, int32_t, uint32_t>(), ""); |
| // static_assert(TypeCheckMaxR<uint32_t, int32_t, int32_t>(), ""); |
| |
| // SafeClamp: Check some cases of explicitly specified return type. The |
| // commented-out lines give compilation errors due to the requested return type |
| // being too small. |
| static_assert(TypeCheckClampR<int16_t, int8_t, uint8_t, int16_t>(), ""); |
| static_assert(TypeCheckClampR<int16_t, int8_t, uint8_t, int32_t>(), ""); |
| // static_assert(TypeCheckClampR<int16_t, int8_t, uint8_t, uint32_t>(), ""); |
| |
| template <typename T1, typename T2, typename Tmin, typename Tmax> |
| constexpr bool CheckMinMax(T1 a, T2 b, Tmin min, Tmax max) { |
| return TypeCheckMinMax<T1, T2, Tmin, Tmax>() && SafeMin(a, b) == min && |
| SafeMax(a, b) == max; |
| } |
| |
| template <typename T, typename L, typename H, typename R> |
| bool CheckClamp(T x, L min, H max, R clamped) { |
| return TypeCheckClamp<T, L, H, R>() && SafeClamp(x, min, max) == clamped; |
| } |
| |
| // SafeMin/SafeMax: Check a few values. |
| static_assert(CheckMinMax(int8_t{1}, int8_t{-1}, int8_t{-1}, int8_t{1}), ""); |
| static_assert(CheckMinMax(uint8_t{1}, int8_t{-1}, int8_t{-1}, uint8_t{1}), ""); |
| static_assert(CheckMinMax(uint8_t{5}, uint64_t{2}, uint8_t{2}, uint64_t{5}), |
| ""); |
| static_assert(CheckMinMax(std::numeric_limits<int32_t>::min(), |
| std::numeric_limits<uint32_t>::max(), |
| std::numeric_limits<int32_t>::min(), |
| std::numeric_limits<uint32_t>::max()), |
| ""); |
| static_assert(CheckMinMax(std::numeric_limits<int32_t>::min(), |
| std::numeric_limits<uint16_t>::max(), |
| std::numeric_limits<int32_t>::min(), |
| int32_t{std::numeric_limits<uint16_t>::max()}), |
| ""); |
| // static_assert(CheckMinMax(1.f, 2, 1.f, 2.f), ""); |
| static_assert(CheckMinMax(1.f, 0.0, 0.0, 1.0), ""); |
| |
| // SafeClamp: Check a few values. |
| TEST(SafeMinmaxTest, Clamp) { |
| EXPECT_TRUE(CheckClamp(int32_t{-1000000}, std::numeric_limits<int16_t>::min(), |
| std::numeric_limits<int16_t>::max(), |
| std::numeric_limits<int16_t>::min())); |
| EXPECT_TRUE(CheckClamp(uint32_t{1000000}, std::numeric_limits<int16_t>::min(), |
| std::numeric_limits<int16_t>::max(), |
| std::numeric_limits<int16_t>::max())); |
| EXPECT_TRUE(CheckClamp(3.f, -1.0, 1.f, 1.0)); |
| EXPECT_TRUE(CheckClamp(3.0, -1.f, 1.f, 1.0)); |
| } |
| |
| } // namespace |
| |
| // These functions aren't used in the tests, but it's useful to look at the |
| // compiler output for them, and verify that (1) the same-signedness Test*Safe |
| // functions result in exactly the same code as their Test*Ref counterparts, |
| // and that (2) the mixed-signedness Test*Safe functions have just a few extra |
| // arithmetic and logic instructions (but no extra control flow instructions). |
| |
| // clang-format off |
| int32_t TestMinRef( int32_t a, int32_t b) { return std::min(a, b); } |
| uint32_t TestMinRef( uint32_t a, uint32_t b) { return std::min(a, b); } |
| int32_t TestMinSafe( int32_t a, int32_t b) { return SafeMin(a, b); } |
| int32_t TestMinSafe( int32_t a, uint32_t b) { return SafeMin(a, b); } |
| int32_t TestMinSafe(uint32_t a, int32_t b) { return SafeMin(a, b); } |
| uint32_t TestMinSafe(uint32_t a, uint32_t b) { return SafeMin(a, b); } |
| // clang-format on |
| |
| int32_t TestClampRef(int32_t x, int32_t a, int32_t b) { |
| return std::max(a, std::min(x, b)); |
| } |
| uint32_t TestClampRef(uint32_t x, uint32_t a, uint32_t b) { |
| return std::max(a, std::min(x, b)); |
| } |
| int32_t TestClampSafe(int32_t x, int32_t a, int32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| int32_t TestClampSafe(int32_t x, int32_t a, uint32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| int32_t TestClampSafe(int32_t x, uint32_t a, int32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| uint32_t TestClampSafe(int32_t x, uint32_t a, uint32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| int32_t TestClampSafe(uint32_t x, int32_t a, int32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| uint32_t TestClampSafe(uint32_t x, int32_t a, uint32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| int32_t TestClampSafe(uint32_t x, uint32_t a, int32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| uint32_t TestClampSafe(uint32_t x, uint32_t a, uint32_t b) { |
| return SafeClamp(x, a, b); |
| } |
| |
| } // namespace rtc |
