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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_CONVERSIONS_H_ | 5 #ifndef BASE_NUMERICS_SAFE_CONVERSIONS_H_ |
6 #define BASE_NUMERICS_SAFE_CONVERSIONS_H_ | 6 #define BASE_NUMERICS_SAFE_CONVERSIONS_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include <limits> | 10 #include <limits> |
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44 // across any range of arithmetic types. StrictNumeric is the return type | 44 // across any range of arithmetic types. StrictNumeric is the return type |
45 // for values extracted from a CheckedNumeric class instance. The raw | 45 // for values extracted from a CheckedNumeric class instance. The raw |
46 // arithmetic value is extracted via static_cast to the underlying type. | 46 // arithmetic value is extracted via static_cast to the underlying type. |
47 // MakeStrictNum() - Creates a new StrictNumeric from the underlying type of | 47 // MakeStrictNum() - Creates a new StrictNumeric from the underlying type of |
48 // the supplied arithmetic or StrictNumeric type. | 48 // the supplied arithmetic or StrictNumeric type. |
49 | 49 |
50 // Convenience function that returns true if the supplied value is in range | 50 // Convenience function that returns true if the supplied value is in range |
51 // for the destination type. | 51 // for the destination type. |
52 template <typename Dst, typename Src> | 52 template <typename Dst, typename Src> |
53 constexpr bool IsValueInRangeForNumericType(Src value) { | 53 constexpr bool IsValueInRangeForNumericType(Src value) { |
54 return internal::DstRangeRelationToSrcRange<Dst>(value) == | 54 return internal::DstRangeRelationToSrcRange<Dst>(value).IsValid(); |
55 internal::RANGE_VALID; | |
56 } | 55 } |
57 | 56 |
58 // Forces a crash, like a CHECK(false). Used for numeric boundary errors. | 57 // Forces a crash, like a CHECK(false). Used for numeric boundary errors. |
59 struct CheckOnFailure { | 58 struct CheckOnFailure { |
60 template <typename T> | 59 template <typename T> |
61 static T HandleFailure() { | 60 static T HandleFailure() { |
62 #if defined(__GNUC__) || defined(__clang__) | 61 #if defined(__GNUC__) || defined(__clang__) |
63 __builtin_trap(); | 62 __builtin_trap(); |
64 #else | 63 #else |
65 ((void)(*(volatile char*)0 = 0)); | 64 ((void)(*(volatile char*)0 = 0)); |
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270 using internal::StrictNumeric; | 269 using internal::StrictNumeric; |
271 using internal::MakeStrictNum; | 270 using internal::MakeStrictNum; |
272 using internal::IsValueNegative; | 271 using internal::IsValueNegative; |
273 | 272 |
274 // Explicitly make a shorter size_t alias for convenience. | 273 // Explicitly make a shorter size_t alias for convenience. |
275 using SizeT = StrictNumeric<size_t>; | 274 using SizeT = StrictNumeric<size_t>; |
276 | 275 |
277 } // namespace base | 276 } // namespace base |
278 | 277 |
279 #endif // BASE_NUMERICS_SAFE_CONVERSIONS_H_ | 278 #endif // BASE_NUMERICS_SAFE_CONVERSIONS_H_ |
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