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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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174 *this -= 1; | 174 *this -= 1; |
175 return value; | 175 return value; |
176 } | 176 } |
177 | 177 |
178 // These static methods behave like a convenience cast operator targeting | 178 // These static methods behave like a convenience cast operator targeting |
179 // the desired CheckedNumeric type. As an optimization, a reference is | 179 // the desired CheckedNumeric type. As an optimization, a reference is |
180 // returned when Src is the same type as T. | 180 // returned when Src is the same type as T. |
181 template <typename Src> | 181 template <typename Src> |
182 static CheckedNumeric<T> cast( | 182 static CheckedNumeric<T> cast( |
183 Src u, | 183 Src u, |
184 typename enable_if<std::numeric_limits<Src>::is_specialized, int>::type = | 184 typename std::enable_if<std::numeric_limits<Src>::is_specialized, |
185 0) { | 185 int>::type = 0) { |
186 return u; | 186 return u; |
187 } | 187 } |
188 | 188 |
189 template <typename Src> | 189 template <typename Src> |
190 static CheckedNumeric<T> cast( | 190 static CheckedNumeric<T> cast( |
191 const CheckedNumeric<Src>& u, | 191 const CheckedNumeric<Src>& u, |
192 typename enable_if<!is_same<Src, T>::value, int>::type = 0) { | 192 typename std::enable_if<!is_same<Src, T>::value, int>::type = 0) { |
193 return u; | 193 return u; |
194 } | 194 } |
195 | 195 |
196 static const CheckedNumeric<T>& cast(const CheckedNumeric<T>& u) { return u; } | 196 static const CheckedNumeric<T>& cast(const CheckedNumeric<T>& u) { return u; } |
197 | 197 |
198 private: | 198 private: |
199 template <typename NumericType> | 199 template <typename NumericType> |
200 struct UnderlyingType { | 200 struct UnderlyingType { |
201 using type = NumericType; | 201 using type = NumericType; |
202 }; | 202 }; |
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289 | 289 |
290 #undef BASE_NUMERIC_ARITHMETIC_OPERATORS | 290 #undef BASE_NUMERIC_ARITHMETIC_OPERATORS |
291 | 291 |
292 } // namespace internal | 292 } // namespace internal |
293 | 293 |
294 using internal::CheckedNumeric; | 294 using internal::CheckedNumeric; |
295 | 295 |
296 } // namespace base | 296 } // namespace base |
297 | 297 |
298 #endif // BASE_NUMERICS_SAFE_MATH_H_ | 298 #endif // BASE_NUMERICS_SAFE_MATH_H_ |
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