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
3// found in the LICENSE file.
4
5#ifndef MOJO_PUBLIC_CPP_SYSTEM_MACROS_H_
6#define MOJO_PUBLIC_CPP_SYSTEM_MACROS_H_
7
8#include "mojo/public/c/system/macros.h"
9
10// Define a set of C++ specific macros.
11// Mojo C++ API users can assume that mojo/public/cpp/system/macros.h
12// includes mojo/public/c/system/macros.h.
13
14// Annotate a virtual method indicating it must be overriding a virtual method
15// in the parent class. Use like:
16//   virtual void foo() OVERRIDE;
17#if defined(_MSC_VER) || defined(__clang__)
18#define MOJO_OVERRIDE override
19#else
20#define MOJO_OVERRIDE
21#endif
22
23// A macro to disallow the copy constructor and operator= functions.
24// This should be used in the private: declarations for a class.
25#define MOJO_DISALLOW_COPY_AND_ASSIGN(TypeName) \
26    TypeName(const TypeName&); \
27    void operator=(const TypeName&)
28
29// Used to calculate the number of elements in an array.
30// (See |arraysize()| in Chromium's base/basictypes.h for more details.)
31namespace mojo {
32template <typename T, size_t N>
33char (&ArraySizeHelper(T (&array)[N]))[N];
34#if !defined(_MSC_VER)
35template <typename T, size_t N>
36char (&ArraySizeHelper(const T (&array)[N]))[N];
37#endif
38}  // namespace mojo
39#define MOJO_ARRAYSIZE(array) (sizeof(::mojo::ArraySizeHelper(array)))
40
41// Used to make a type move-only in C++03. See Chromium's base/move.h for more
42// details.
43#define MOJO_MOVE_ONLY_TYPE_FOR_CPP_03(type, rvalue_type) \
44   private: \
45    struct rvalue_type { \
46      explicit rvalue_type(type* object) : object(object) {} \
47      type* object; \
48    }; \
49    type(type&); \
50    void operator=(type&); \
51   public: \
52    operator rvalue_type() { return rvalue_type(this); } \
53    type Pass() { return type(rvalue_type(this)); } \
54    typedef void MoveOnlyTypeForCPP03; \
55   private:
56
57#endif  // MOJO_PUBLIC_CPP_SYSTEM_MACROS_H_
58