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| 1 // Copyright 2014 The Crashpad Authors. All rights reserved. | 1 // Copyright 2014 The Crashpad Authors. All rights reserved. | 
| 2 // | 2 // | 
| 3 // Licensed under the Apache License, Version 2.0 (the "License"); | 3 // Licensed under the Apache License, Version 2.0 (the "License"); | 
| 4 // you may not use this file except in compliance with the License. | 4 // you may not use this file except in compliance with the License. | 
| 5 // You may obtain a copy of the License at | 5 // You may obtain a copy of the License at | 
| 6 // | 6 // | 
| 7 //     http://www.apache.org/licenses/LICENSE-2.0 | 7 //     http://www.apache.org/licenses/LICENSE-2.0 | 
| 8 // | 8 // | 
| 9 // Unless required by applicable law or agreed to in writing, software | 9 // Unless required by applicable law or agreed to in writing, software | 
| 10 // distributed under the License is distributed on an "AS IS" BASIS, | 10 // distributed under the License is distributed on an "AS IS" BASIS, | 
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| 23 #include "base/numerics/safe_math.h" | 23 #include "base/numerics/safe_math.h" | 
| 24 | 24 | 
| 25 namespace crashpad { | 25 namespace crashpad { | 
| 26 | 26 | 
| 27 //! \brief Ensures that a range, composed of a base and size, does not overflow | 27 //! \brief Ensures that a range, composed of a base and size, does not overflow | 
| 28 //!     its data type. | 28 //!     its data type. | 
| 29 template <typename ValueType, typename SizeType = ValueType> | 29 template <typename ValueType, typename SizeType = ValueType> | 
| 30 class CheckedRange { | 30 class CheckedRange { | 
| 31  public: | 31  public: | 
| 32   CheckedRange(ValueType base, SizeType size) { | 32   CheckedRange(ValueType base, SizeType size) { | 
| 33     COMPILE_ASSERT(!std::numeric_limits<SizeType>::is_signed, | 33     static_assert(!std::numeric_limits<SizeType>::is_signed, | 
| 34                    SizeType_must_be_unsigned); | 34                   "SizeType must be unsigned"); | 
| 35     SetRange(base, size); | 35     SetRange(base, size); | 
| 36   } | 36   } | 
| 37 | 37 | 
| 38   //! \brief Sets the range’s base and size to \a base and \a size, | 38   //! \brief Sets the range’s base and size to \a base and \a size, | 
| 39   //!     respectively. | 39   //!     respectively. | 
| 40   void SetRange(ValueType base, SizeType size) { | 40   void SetRange(ValueType base, SizeType size) { | 
| 41     base_ = base; | 41     base_ = base; | 
| 42     size_ = size; | 42     size_ = size; | 
| 43   } | 43   } | 
| 44 | 44 | 
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| 106  private: | 106  private: | 
| 107   ValueType base_; | 107   ValueType base_; | 
| 108   SizeType size_; | 108   SizeType size_; | 
| 109 | 109 | 
| 110   DISALLOW_COPY_AND_ASSIGN(CheckedRange); | 110   DISALLOW_COPY_AND_ASSIGN(CheckedRange); | 
| 111 }; | 111 }; | 
| 112 | 112 | 
| 113 }  // namespace crashpad | 113 }  // namespace crashpad | 
| 114 | 114 | 
| 115 #endif  // CRASHPAD_UTIL_NUMERIC_CHECKED_RANGE_H_ | 115 #endif  // CRASHPAD_UTIL_NUMERIC_CHECKED_RANGE_H_ | 
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