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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_SAFE_CONVERSIONS_H_ | 5 #ifndef BASE_SAFE_CONVERSIONS_H_ |
6 #define BASE_SAFE_CONVERSIONS_H_ | 6 #define BASE_SAFE_CONVERSIONS_H_ |
7 | 7 |
8 #include <limits> | 8 #include <limits> |
9 | 9 |
10 #include "base/logging.h" | 10 #include "base/logging.h" |
11 #include "base/numerics/safe_conversions_impl.h" | 11 #include "base/numerics/safe_conversions_impl.h" |
12 | 12 |
13 namespace base { | 13 namespace base { |
14 | 14 |
15 // Convenience function that returns true if the supplied value is in range | 15 // Convenience function that returns true if the supplied value is in range |
16 // for the destination type. | 16 // for the destination type. |
17 template <typename Dst, typename Src> | 17 template <typename Dst, typename Src> |
18 inline bool IsValueInRangeForNumericType(Src value) { | 18 inline bool IsValueInRangeForNumericType(Src value) { |
19 return internal::RangeCheck<Dst>(value) == internal::TYPE_VALID; | 19 return internal::DstRangeRelationToSrcRange<Dst>(value) == |
| 20 internal::RANGE_VALID; |
20 } | 21 } |
21 | 22 |
22 // checked_cast<> is analogous to static_cast<> for numeric types, | 23 // checked_cast<> is analogous to static_cast<> for numeric types, |
23 // except that it CHECKs that the specified numeric conversion will not | 24 // except that it CHECKs that the specified numeric conversion will not |
24 // overflow or underflow. NaN source will always trigger a CHECK. | 25 // overflow or underflow. NaN source will always trigger a CHECK. |
25 template <typename Dst, typename Src> | 26 template <typename Dst, typename Src> |
26 inline Dst checked_cast(Src value) { | 27 inline Dst checked_cast(Src value) { |
27 CHECK(IsValueInRangeForNumericType<Dst>(value)); | 28 CHECK(IsValueInRangeForNumericType<Dst>(value)); |
28 return static_cast<Dst>(value); | 29 return static_cast<Dst>(value); |
29 } | 30 } |
30 | 31 |
31 // saturated_cast<> is analogous to static_cast<> for numeric types, except | 32 // saturated_cast<> is analogous to static_cast<> for numeric types, except |
32 // that the specified numeric conversion will saturate rather than overflow or | 33 // that the specified numeric conversion will saturate rather than overflow or |
33 // underflow. NaN assignment to an integral will trigger a CHECK condition. | 34 // underflow. NaN assignment to an integral will trigger a CHECK condition. |
34 template <typename Dst, typename Src> | 35 template <typename Dst, typename Src> |
35 inline Dst saturated_cast(Src value) { | 36 inline Dst saturated_cast(Src value) { |
36 // Optimization for floating point values, which already saturate. | 37 // Optimization for floating point values, which already saturate. |
37 if (std::numeric_limits<Dst>::is_iec559) | 38 if (std::numeric_limits<Dst>::is_iec559) |
38 return static_cast<Dst>(value); | 39 return static_cast<Dst>(value); |
39 | 40 |
40 switch (internal::RangeCheck<Dst>(value)) { | 41 switch (internal::DstRangeRelationToSrcRange<Dst>(value)) { |
41 case internal::TYPE_VALID: | 42 case internal::RANGE_VALID: |
42 return static_cast<Dst>(value); | 43 return static_cast<Dst>(value); |
43 | 44 |
44 case internal::TYPE_UNDERFLOW: | 45 case internal::RANGE_UNDERFLOW: |
45 return std::numeric_limits<Dst>::min(); | 46 return std::numeric_limits<Dst>::min(); |
46 | 47 |
47 case internal::TYPE_OVERFLOW: | 48 case internal::RANGE_OVERFLOW: |
48 return std::numeric_limits<Dst>::max(); | 49 return std::numeric_limits<Dst>::max(); |
49 | 50 |
50 // Should fail only on attempting to assign NaN to a saturated integer. | 51 // Should fail only on attempting to assign NaN to a saturated integer. |
51 case internal::TYPE_INVALID: | 52 case internal::RANGE_INVALID: |
52 CHECK(false); | 53 CHECK(false); |
53 return std::numeric_limits<Dst>::max(); | 54 return std::numeric_limits<Dst>::max(); |
54 } | 55 } |
55 | 56 |
56 NOTREACHED(); | 57 NOTREACHED(); |
57 return static_cast<Dst>(value); | 58 return static_cast<Dst>(value); |
58 } | 59 } |
59 | 60 |
60 } // namespace base | 61 } // namespace base |
61 | 62 |
62 #endif // BASE_SAFE_CONVERSIONS_H_ | 63 #endif // BASE_SAFE_CONVERSIONS_H_ |
63 | 64 |
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