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_ */ 66
