发信人: warehouse()
整理人: girlrong(1999-11-09 10:16:42), 站内信件
|
--
※ 来源:．月光软件站 http://www.moon-soft.com．[FROM: 202.98.35.154]
发信人: vcc (vcc), 信区: C
标 题: Re: UNREFERENCED_PARAMETER是干什么的？
发信站: 网易虚拟社区 (Tue Jul 6 12:52:09 1999), 站内信件
【 在 warehouse (石头) 的大作中提到: 】
用来消除编译警告，未引用的参数的警告。
看看这个宏的定义就知道了，
相当于：
void test(int /* i */) { // 参数 i 在函数中没有被引用
...
}
等价于
void test(int i) {
UNREFERENCED_PARAMETER(i);// 参数 i 在函数中没有被引用
....
}
//
// Macros used to eliminate compiler warning generated when formal
// parameters or local variables are not declared.
//
// Use DBG_UNREFERENCED_PARAMETER() when a parameter is not yet
// referenced but will be once the module is completely developed.
//
// Use DBG_UNREFERENCED_LOCAL_VARIABLE() when a local variable is not
yet
// referenced but will be once the module is completely developed.
//
// Use UNREFERENCED_PARAMETER() if a parameter will never be reference
d.
//
// DBG_UNREFERENCED_PARAMETER and DBG_UNREFERENCED_LOCAL_VARIABLE will
// eventually be made into a null macro to help determine whether ther
e
// is unfinished work.
//
#if ! (defined(lint) || defined(_lint))
#define UNREFERENCED_PARAMETER(P) (P)
#define DBG_UNREFERENCED_PARAMETER(P) (P)
#define DBG_UNREFERENCED_LOCAL_VARIABLE(V) (V)
#else // lint or _lint
// Note: lint -e530 says don't complain about uninitialized variables
for
// this. line +e530 turns that checking back on. Error 527 has to do
with
// unreachable code.
#define UNREFERENCED_PARAMETER(P) \
/*lint -e527 -e530 */ \
{ \
(P) = (P); \
} \
/*lint +e527 +e530 */
#define DBG_UNREFERENCED_PARAMETER(P) \
/*lint -e527 -e530 */ \
{ \
(P) = (P); \
} \
/*lint +e527 +e530 */
#define DBG_UNREFERENCED_LOCAL_VARIABLE(V) \
/*lint -e527 -e530 */ \
{ \
(V) = (V); \
} \
/*lint +e527 +e530 */
#endif // lint or _lint
--
※ 来源:．月光软件站 http://www.moon-soft.com．[FROM: 202.103.146.7]
|
|