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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 // This file contains macros and macro-like constructs (e.g., templates) that | 5 // This file contains macros and macro-like constructs (e.g., templates) that |
| 6 // are commonly used throughout Chromium source. (It may also contain things | 6 // are commonly used throughout Chromium source. (It may also contain things |
| 7 // that are closely related to things that are commonly used that belong in this | 7 // that are closely related to things that are commonly used that belong in this |
| 8 // file.) | 8 // file.) |
| 9 | 9 |
| 10 #ifndef BASE_MACROS_H_ | 10 #ifndef BASE_MACROS_H_ |
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| 28 #undef COMPILE_ASSERT | 28 #undef COMPILE_ASSERT |
| 29 | 29 |
| 30 #if __cplusplus >= 201103L | 30 #if __cplusplus >= 201103L |
| 31 | 31 |
| 32 // Under C++11, just use static_assert. | 32 // Under C++11, just use static_assert. |
| 33 #define COMPILE_ASSERT(expr, msg) static_assert(expr, #msg) | 33 #define COMPILE_ASSERT(expr, msg) static_assert(expr, #msg) |
| 34 | 34 |
| 35 #else | 35 #else |
| 36 | 36 |
| 37 template <bool> | 37 template <bool> |
| 38 struct CompileAssert { | 38 struct CompileAssert {}; |
| 39 }; | |
| 40 | 39 |
| 41 // Annotate a variable indicating it's ok if the variable is not used. | 40 // Annotate a variable indicating it's ok if the variable is not used. |
| 42 // (Typically used to silence a compiler warning when the assignment | 41 // (Typically used to silence a compiler warning when the assignment |
| 43 // is important for some other reason.) | 42 // is important for some other reason.) |
| 44 // Use like: | 43 // Use like: |
| 45 // int x ALLOW_UNUSED = ...; | 44 // int x ALLOW_UNUSED = ...; |
| 46 #if defined(COMPILER_GCC) | 45 #if defined(COMPILER_GCC) |
| 47 #define ALLOW_UNUSED __attribute__((unused)) | 46 #define ALLOW_UNUSED __attribute__((unused)) |
| 48 #else | 47 #else |
| 49 #define ALLOW_UNUSED | 48 #define ALLOW_UNUSED |
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| 89 // - The array size is (bool(expr) ? 1 : -1), instead of simply | 88 // - The array size is (bool(expr) ? 1 : -1), instead of simply |
| 90 // | 89 // |
| 91 // ((expr) ? 1 : -1). | 90 // ((expr) ? 1 : -1). |
| 92 // | 91 // |
| 93 // This is to avoid running into a bug in MS VC 7.1, which | 92 // This is to avoid running into a bug in MS VC 7.1, which |
| 94 // causes ((0.0) ? 1 : -1) to incorrectly evaluate to 1. | 93 // causes ((0.0) ? 1 : -1) to incorrectly evaluate to 1. |
| 95 | 94 |
| 96 #endif | 95 #endif |
| 97 | 96 |
| 98 #endif // BASE_MACROS_H_ | 97 #endif // BASE_MACROS_H_ |
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