1 // Copyright 2013 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_SYSTEM_MACROS_H_ 6 #define MOJO_PUBLIC_SYSTEM_MACROS_H_ 7 8 #include <stddef.h> 9 10 // Annotate a variable indicating it's okay if it's unused. 11 // Use like: 12 // int x MOJO_ALLOW_UNUSED = ...; 13 #if defined(__GNUC__) 14 #define MOJO_ALLOW_UNUSED __attribute__((unused)) 15 #else 16 #define MOJO_ALLOW_UNUSED 17 #endif 18 19 // Annotate a function indicating that the caller must examine the return value. 20 // Use like: 21 // int foo() MOJO_WARN_UNUSED_RESULT; 22 #if defined(__GNUC__) 23 #define MOJO_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) 24 #else 25 #define MOJO_WARN_UNUSED_RESULT 26 #endif 27 28 #ifdef __cplusplus 29 30 // Annotate a virtual method indicating it must be overriding a virtual method 31 // in the parent class. Use like: 32 // virtual void foo() OVERRIDE; 33 #if defined(_MSC_VER) || defined(__clang__) 34 #define MOJO_OVERRIDE override 35 #else 36 #define MOJO_OVERRIDE 37 #endif 38 39 // A macro to disallow the copy constructor and operator= functions. 40 // This should be used in the private: declarations for a class. 41 #define MOJO_DISALLOW_COPY_AND_ASSIGN(TypeName) \ 42 TypeName(const TypeName&); \ 43 void operator=(const TypeName&) 44 45 // Used to assert things at compile time. 46 namespace mojo { template <bool> struct CompileAssert {}; } 47 #define MOJO_COMPILE_ASSERT(expr, msg) \ 48 typedef ::mojo::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1] 49 50 // Used to calculate the number of elements in an array. 51 // (See |arraysize()| in Chromium's base/basictypes.h for more details.) 52 namespace mojo { 53 template <typename T, size_t N> 54 char (&ArraySizeHelper(T (&array)[N]))[N]; 55 #if !defined(_MSC_VER) 56 template <typename T, size_t N> 57 char (&ArraySizeHelper(const T (&array)[N]))[N]; 58 #endif 59 } // namespace mojo 60 #define MOJO_ARRAYSIZE(array) (sizeof(::mojo::ArraySizeHelper(array))) 61 62 // Used to make a type move-only in C++03. See Chromium's base/move.h for more 63 // details. 64 #define MOJO_MOVE_ONLY_TYPE_FOR_CPP_03(type, rvalue_type) \ 65 private: \ 66 struct rvalue_type { \ 67 explicit rvalue_type(type* object) : object(object) {} \ 68 type* object; \ 69 }; \ 70 type(type&); \ 71 void operator=(type&); \ 72 public: \ 73 operator rvalue_type() { return rvalue_type(this); } \ 74 type Pass() { return type(rvalue_type(this)); } \ 75 typedef void MoveOnlyTypeForCPP03; \ 76 private: 77 78 #endif // __cplusplus 79 80 #endif // MOJO_PUBLIC_SYSTEM_MACROS_H_ 81
