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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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56 char (&ArraySizeHelper(T (&array)[N]))[N]; | 56 char (&ArraySizeHelper(T (&array)[N]))[N]; |
57 | 57 |
58 // That gcc wants both of these prototypes seems mysterious. VC, for | 58 // That gcc wants both of these prototypes seems mysterious. VC, for |
59 // its part, can't decide which to use (another mystery). Matching of | 59 // its part, can't decide which to use (another mystery). Matching of |
60 // template overloads: the final frontier. | 60 // template overloads: the final frontier. |
61 #ifndef _MSC_VER | 61 #ifndef _MSC_VER |
62 template <typename T, size_t N> | 62 template <typename T, size_t N> |
63 char (&ArraySizeHelper(const T (&array)[N]))[N]; | 63 char (&ArraySizeHelper(const T (&array)[N]))[N]; |
64 #endif | 64 #endif |
65 | 65 |
66 #define arraysize(array) (sizeof(ArraySizeHelper(array))) | 66 #define arraysize(array) (sizeof(::ArraySizeHelper(array))) |
67 | 67 |
68 | 68 |
69 // Use implicit_cast as a safe version of static_cast or const_cast | 69 // Use implicit_cast as a safe version of static_cast or const_cast |
70 // for upcasting in the type hierarchy (i.e. casting a pointer to Foo | 70 // for upcasting in the type hierarchy (i.e. casting a pointer to Foo |
71 // to a pointer to SuperclassOfFoo or casting a pointer to Foo to | 71 // to a pointer to SuperclassOfFoo or casting a pointer to Foo to |
72 // a const pointer to Foo). | 72 // a const pointer to Foo). |
73 // When you use implicit_cast, the compiler checks that the cast is safe. | 73 // When you use implicit_cast, the compiler checks that the cast is safe. |
74 // Such explicit implicit_casts are necessary in surprisingly many | 74 // Such explicit implicit_casts are necessary in surprisingly many |
75 // situations where C++ demands an exact type match instead of an | 75 // situations where C++ demands an exact type match instead of an |
76 // argument type convertible to a target type. | 76 // argument type convertible to a target type. |
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199 | 199 |
200 // Use these to declare and define a static local variable (static T;) so that | 200 // Use these to declare and define a static local variable (static T;) so that |
201 // it is leaked so that its destructors are not called at exit. If you need | 201 // it is leaked so that its destructors are not called at exit. If you need |
202 // thread-safe initialization, use base/lazy_instance.h instead. | 202 // thread-safe initialization, use base/lazy_instance.h instead. |
203 #define CR_DEFINE_STATIC_LOCAL(type, name, arguments) \ | 203 #define CR_DEFINE_STATIC_LOCAL(type, name, arguments) \ |
204 static type& name = *new type arguments | 204 static type& name = *new type arguments |
205 | 205 |
206 } // base | 206 } // base |
207 | 207 |
208 #endif // BASE_MACROS_H_ | 208 #endif // BASE_MACROS_H_ |
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