Mojo: Split off the C++ parts of mojo/public/c/system macros.h to their own file.

mojo/public/c/system/macros.h

 // Copyright 2014 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_C_SYSTEM_MACROS_H_
 #define MOJO_PUBLIC_C_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 -------------------------------------------------------------
-
+// This macro is currently C++-only, but we want to use it in the C core.h.
 #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];
+#else
+#define MOJO_COMPILE_ASSERT(expr, msg)
 #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_C_SYSTEM_MACROS_H_