native_client_sdk/src/libraries/sdk_util/macros.h

   1 /* Copyright (c) 2012 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 LIBRARIES_SDK_UTIL_MACROS_H_
   6 #define LIBRARIES_SDK_UTIL_MACROS_H_
   7
   8 /**
   9  * A macro to disallow the evil copy constructor and operator= functions
  10  * This should be used in the private: declarations for a class.
  11  */
  12 #define DISALLOW_COPY_AND_ASSIGN(TypeName)      \
  13   TypeName(const TypeName&);                    \
  14   void operator=(const TypeName&)
  15
  16 /** returns the size of a member of a struct. */
  17 #define MEMBER_SIZE(struct_name, member) sizeof(((struct_name*)0)->member)
  18
  19 /**
  20  * Macros to prevent name mangling of definitions, allowing them to be
  21  * referenced from C.
  22  */
  23 #ifdef __cplusplus
  24 # define EXTERN_C_BEGIN  extern "C" {
  25 # define EXTERN_C_END    }
  26 #else
  27 # define EXTERN_C_BEGIN
  28 # define EXTERN_C_END
  29 #endif  /* __cplusplus */
  30
  31 /**
  32  * Macros to help force linkage of symbols that otherwise would not be
  33  * included.
  34  *
  35  * // In a source file that you want to force linkage (file scope):
  36  * FORCE_LINK_THIS(myfilename);
  37  *
  38  * // In a source file that you are sure will be linked (file scope):
  39  * FORCE_LINK_THAT(myfilename)
  40  *
  41  */
  42 #define FORCE_LINK_THIS(x) int force_link_##x = 0;
  43 #define FORCE_LINK_THAT(x) \
  44   void force_link_function_##x() { \
  45     extern int force_link_##x; \
  46     force_link_##x = 1; \
  47   }
  48
  49 /**
  50  * Macro to error out when a printf-like function is passed incorrect arguments.
  51  *
  52  * Use like this:
  53  * void foo(const char* fmt, ...) PRINTF_LIKE(1, 2);
  54  *
  55  * The first argument is the location of the fmt string (1-based).
  56  * The second argument is the location of the first argument to validate (also
  57  *   1-based, but can be zero if the function uses a va_list, like vprintf.)
  58  */
  59 #if defined(__GNUC__)
  60 #define PRINTF_LIKE(a, b) __attribute__ ((format(printf, a, b)))
  61 #else
  62 #define PRINTF_LIKE(a, b)
  63 #endif
  64
  65 #endif  /* LIBRARIES_SDK_UTIL_MACROS_H_ */