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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_NUMERICS_SAFE_MATH_H_ | 5 #ifndef BASE_NUMERICS_SAFE_MATH_H_ |
6 #define BASE_NUMERICS_SAFE_MATH_H_ | 6 #define BASE_NUMERICS_SAFE_MATH_H_ |
7 | 7 |
8 #include "base/numerics/safe_math_impl.h" | 8 #include "base/numerics/safe_math_impl.h" |
9 | 9 |
10 namespace base { | 10 namespace base { |
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138 RangeConstraint validity; | 138 RangeConstraint validity; |
139 T value = CheckedAbs(state_.value(), &validity); | 139 T value = CheckedAbs(state_.value(), &validity); |
140 // Absolute value is always valid for floating point. | 140 // Absolute value is always valid for floating point. |
141 if (std::numeric_limits<T>::is_iec559) | 141 if (std::numeric_limits<T>::is_iec559) |
142 return CheckedNumeric<T>(value); | 142 return CheckedNumeric<T>(value); |
143 | 143 |
144 validity = GetRangeConstraint(state_.validity() | validity); | 144 validity = GetRangeConstraint(state_.validity() | validity); |
145 return CheckedNumeric<T>(value, validity); | 145 return CheckedNumeric<T>(value, validity); |
146 } | 146 } |
147 | 147 |
| 148 // This function is available only for integral types. It returns an unsigned |
| 149 // integer of the same width as the source type, containing the absolute value |
| 150 // of the source, and properly handling signed min. |
| 151 CheckedNumeric<typename UnsignedOrFloatForSize<T>::type> UnsignedAbs() const { |
| 152 return CheckedNumeric<typename UnsignedOrFloatForSize<T>::type>( |
| 153 CheckedUnsignedAbs(state_.value()), state_.validity()); |
| 154 } |
| 155 |
148 CheckedNumeric& operator++() { | 156 CheckedNumeric& operator++() { |
149 *this += 1; | 157 *this += 1; |
150 return *this; | 158 return *this; |
151 } | 159 } |
152 | 160 |
153 CheckedNumeric operator++(int) { | 161 CheckedNumeric operator++(int) { |
154 CheckedNumeric value = *this; | 162 CheckedNumeric value = *this; |
155 *this += 1; | 163 *this += 1; |
156 return value; | 164 return value; |
157 } | 165 } |
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270 | 278 |
271 #undef BASE_NUMERIC_ARITHMETIC_OPERATORS | 279 #undef BASE_NUMERIC_ARITHMETIC_OPERATORS |
272 | 280 |
273 } // namespace internal | 281 } // namespace internal |
274 | 282 |
275 using internal::CheckedNumeric; | 283 using internal::CheckedNumeric; |
276 | 284 |
277 } // namespace base | 285 } // namespace base |
278 | 286 |
279 #endif // BASE_NUMERICS_SAFE_MATH_H_ | 287 #endif // BASE_NUMERICS_SAFE_MATH_H_ |
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