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79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
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// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This file contains macros and macro-like constructs (e.g., templates) that
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// are commonly used throughout Chromium source. (It may also contain things
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// that are closely related to things that are commonly used that belong in this
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// file.)
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#ifndef BASE_MACROS_H_
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#define BASE_MACROS_H_
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#include <stddef.h> // For size_t.
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// Distinguish mips32.
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#if defined(__mips__) && (_MIPS_SIM == _ABIO32) && !defined(__mips32__)
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#define __mips32__
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#endif
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// Distinguish mips64.
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#if defined(__mips__) && (_MIPS_SIM == _ABI64) && !defined(__mips64__)
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#define __mips64__
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#endif
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// Put this in the declarations for a class to be uncopyable.
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#define DISALLOW_COPY(TypeName) \
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TypeName(const TypeName&) = delete
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// Put this in the declarations for a class to be unassignable.
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#define DISALLOW_ASSIGN(TypeName) TypeName& operator=(const TypeName&) = delete
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// Put this in the declarations for a class to be uncopyable and unassignable.
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#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
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DISALLOW_COPY(TypeName); \
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DISALLOW_ASSIGN(TypeName)
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// A macro to disallow all the implicit constructors, namely the
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// default constructor, copy constructor and operator= functions.
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// This is especially useful for classes containing only static methods.
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#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
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TypeName() = delete; \
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DISALLOW_COPY_AND_ASSIGN(TypeName)
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// The arraysize(arr) macro returns the # of elements in an array arr. The
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// expression is a compile-time constant, and therefore can be used in defining
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// new arrays, for example. If you use arraysize on a pointer by mistake, you
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// will get a compile-time error. For the technical details, refer to
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// http://blogs.msdn.com/b/the1/archive/2004/05/07/128242.aspx.
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// This template function declaration is used in defining arraysize.
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// Note that the function doesn't need an implementation, as we only
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// use its type.
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template <typename T, size_t N> char (&ArraySizeHelper(T (&array)[N]))[N];
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#define arraysize(array) (sizeof(ArraySizeHelper(array)))
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// Used to explicitly mark the return value of a function as unused. If you are
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// really sure you don't want to do anything with the return value of a function
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// that has been marked WARN_UNUSED_RESULT, wrap it with this. Example:
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//
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// std::unique_ptr<MyType> my_var = ...;
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// if (TakeOwnership(my_var.get()) == SUCCESS)
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// ignore_result(my_var.release());
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//
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template<typename T>
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inline void ignore_result(const T&) {
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}
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namespace base {
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// Use these to declare and define a static local variable (static T;) so that
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// it is leaked so that its destructors are not called at exit. This is
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// thread-safe.
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#define CR_DEFINE_STATIC_LOCAL(type, name, arguments) \
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static type& name = *new type arguments
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} // base
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#endif // BASE_MACROS_H_
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