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Issue 935333002: Update from https://crrev.com/316786 (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 10 months ago
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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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