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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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| 34 // third_party libraries and get rid of it. | 34 // third_party libraries and get rid of it. |
| 35 #define DISALLOW_EVIL_CONSTRUCTORS(TypeName) DISALLOW_COPY_AND_ASSIGN(TypeName) | 35 #define DISALLOW_EVIL_CONSTRUCTORS(TypeName) DISALLOW_COPY_AND_ASSIGN(TypeName) |
| 36 | 36 |
| 37 // A macro to disallow all the implicit constructors, namely the | 37 // A macro to disallow all the implicit constructors, namely the |
| 38 // default constructor, copy constructor and operator= functions. | 38 // default constructor, copy constructor and operator= functions. |
| 39 // | 39 // |
| 40 // This should be used in the private: declarations for a class | 40 // This should be used in the private: declarations for a class |
| 41 // that wants to prevent anyone from instantiating it. This is | 41 // that wants to prevent anyone from instantiating it. This is |
| 42 // especially useful for classes containing only static methods. | 42 // especially useful for classes containing only static methods. |
| 43 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ | 43 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ |
| 44 TypeName(); \ | 44 TypeName() = delete; \ |
| 45 DISALLOW_COPY_AND_ASSIGN(TypeName) | 45 DISALLOW_COPY_AND_ASSIGN(TypeName) |
| 46 | 46 |
| 47 // The arraysize(arr) macro returns the # of elements in an array arr. | 47 // The arraysize(arr) macro returns the # of elements in an array arr. |
| 48 // The expression is a compile-time constant, and therefore can be | 48 // The expression is a compile-time constant, and therefore can be |
| 49 // used in defining new arrays, for example. If you use arraysize on | 49 // used in defining new arrays, for example. If you use arraysize on |
| 50 // a pointer by mistake, you will get a compile-time error. | 50 // a pointer by mistake, you will get a compile-time error. |
| 51 | 51 |
| 52 // This template function declaration is used in defining arraysize. | 52 // This template function declaration is used in defining arraysize. |
| 53 // Note that the function doesn't need an implementation, as we only | 53 // Note that the function doesn't need an implementation, as we only |
| 54 // use its type. | 54 // use its type. |
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| 189 | 189 |
| 190 // Use these to declare and define a static local variable (static T;) so that | 190 // Use these to declare and define a static local variable (static T;) so that |
| 191 // it is leaked so that its destructors are not called at exit. If you need | 191 // it is leaked so that its destructors are not called at exit. If you need |
| 192 // thread-safe initialization, use base/lazy_instance.h instead. | 192 // thread-safe initialization, use base/lazy_instance.h instead. |
| 193 #define CR_DEFINE_STATIC_LOCAL(type, name, arguments) \ | 193 #define CR_DEFINE_STATIC_LOCAL(type, name, arguments) \ |
| 194 static type& name = *new type arguments | 194 static type& name = *new type arguments |
| 195 | 195 |
| 196 } // base | 196 } // base |
| 197 | 197 |
| 198 #endif // BASE_MACROS_H_ | 198 #endif // BASE_MACROS_H_ |
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