Mojo: Move public C system header files to mojo/public/c/system/.

mojo/public/system/macros.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MOJO_PUBLIC_SYSTEM_MACROS_H_
-#define MOJO_PUBLIC_SYSTEM_MACROS_H_
-
-#include <stddef.h>
-
-// Annotate a variable indicating it's okay if it's unused.
-// Use like:
-//   int x MOJO_ALLOW_UNUSED = ...;
-#if defined(__GNUC__)
-#define MOJO_ALLOW_UNUSED __attribute__((unused))
-#else
-#define MOJO_ALLOW_UNUSED
-#endif
-
-// Annotate a function indicating that the caller must examine the return value.
-// Use like:
-//   int foo() MOJO_WARN_UNUSED_RESULT;
-// Note that it can only be used on the prototype, and not the definition.
-#if defined(__GNUC__)
-#define MOJO_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
-#else
-#define MOJO_WARN_UNUSED_RESULT
-#endif
-
-// C++-only macros -------------------------------------------------------------
-
-#ifdef __cplusplus
-
-// Annotate a virtual method indicating it must be overriding a virtual method
-// in the parent class. Use like:
-//   virtual void foo() OVERRIDE;
-#if defined(_MSC_VER) || defined(__clang__)
-#define MOJO_OVERRIDE override
-#else
-#define MOJO_OVERRIDE
-#endif
-
-// A macro to disallow the copy constructor and operator= functions.
-// This should be used in the private: declarations for a class.
-#define MOJO_DISALLOW_COPY_AND_ASSIGN(TypeName) \
-    TypeName(const TypeName&); \
-    void operator=(const TypeName&)
-
-// Used to assert things at compile time.
-namespace mojo { template <bool> struct CompileAssert {}; }
-#define MOJO_COMPILE_ASSERT(expr, msg) \
-    typedef ::mojo::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
-
-// Used to calculate the number of elements in an array.
-// (See |arraysize()| in Chromium's base/basictypes.h for more details.)
-namespace mojo {
-template <typename T, size_t N>
-char (&ArraySizeHelper(T (&array)[N]))[N];
-#if !defined(_MSC_VER)
-template <typename T, size_t N>
-char (&ArraySizeHelper(const T (&array)[N]))[N];
-#endif
-}  // namespace mojo
-#define MOJO_ARRAYSIZE(array) (sizeof(::mojo::ArraySizeHelper(array)))
-
-// Used to make a type move-only in C++03. See Chromium's base/move.h for more
-// details.
-#define MOJO_MOVE_ONLY_TYPE_FOR_CPP_03(type, rvalue_type) \
- private: \
-  struct rvalue_type { \
-    explicit rvalue_type(type* object) : object(object) {} \
-    type* object; \
-  }; \
-  type(type&); \
-  void operator=(type&); \
- public: \
-  operator rvalue_type() { return rvalue_type(this); } \
-  type Pass() { return type(rvalue_type(this)); } \
-  typedef void MoveOnlyTypeForCPP03; \
- private:
-
-#endif  // __cplusplus
-
-#endif  // MOJO_PUBLIC_SYSTEM_MACROS_H_