即时创建匿名本地变量以及更多... [英] Creating anonymous local variables on-the-fly and more...
问题描述
大家好，
给出以下结构
typedef struct _MyStruct
{
int a;
int b;
} MyStruct;
....结束以下函数
void foo（MyStruct * myStruct）
{
...
}
是否可以实现类似
int main（）
{
/ *传统方式* /
MyStruct s = {1,2};
foo（& s）; / * OK * /
/ *而不是声明局部变量s，my_macro应该
自动创建
a MyStruct变量到堆栈并返回其地址;这可能是
吗？
* /
foo（my_macro（1,2））; /* 怎么样？那可能吗？ * /
}
谢谢，
j3d。
< gi ************ @ agamura.comwrote in message
news：11 ******** **************@r29g2000hsg.googlegr oups.com ...
大家好，
给定以下结构
[...]
>
...结束以下函数
[...]
>
是否可以实现类似
[...]
我不知道你为什么要那样做。无论如何，这基本上是我现在所能想到的所有现金：
__________________________
typedef struct _MyStruct {
int a;
int b;
} MyStruct;
void foo（MyStruct * myStruct）{
}
#define MY_MACRO（mp_func，mp_sinit）{\
MyStruct Temp = mp_sinit（）; \
foo（& Temp）; \
}
int main（无效）{
#define FOO_SINIT（）{1,2}
MY_MACRO（foo，FOO_SINIT）;
返回0;
}
__________________________
奇怪......
" Chris Thomasson" < cr ***** @ comcast.netwrote in message
新闻：-O ************************ ****** @ comcast.com ...
[...]
__________________________
[...]
>
#define MY_MACRO（mp_func，mp_sinit）{\\ \\ / $
MyStruct Temp = mp_sinit（）; \
foo（& Temp）; \
}
oops！应该读作：
#define MY_MACRO（mp_func，mp_sinit）{\
MyStruct Temp = mp_sinit（）; \
mp_func（& Temp）; \
}
[...]
__________________________
对于任何混淆感到抱歉。
gi ************ @ agamura.com 写道：
大家好，<给定以下结构
typedef struct _MyStruct
{
int a;
int b;
} MyStruct;
...结束以下功能
void foo（MyStruct * myStruct）
{
...
}
是否可以实现类似
int main（）
{
/ *传统方式* /
MyStruct s = {1,2};
foo（& s）; / * OK * /
/ *而不是声明局部变量s，my_macro应该
自动创建
a MyStruct变量到堆栈并返回其地址;这可能是
吗？
* /
foo（my_macro（1,2））; /* 怎么样？那可能吗？ * /
}
除了Chris Thomasson的建议，它有自己的问题
（临时变量和其他变量之间的名称冲突;
如果你想使用调用foo（）的结果？等等，我可以认为
无法在C中做你想做的事。
也许你想解释一下你想要达到的目标，我们可能会有一些b $ b其他建议。
Hi guys,
Given the following structure
typedef struct _MyStruct
{
int a;
int b;
} MyStruct;
.... end the following function
void foo(MyStruct *myStruct)
{
...
}
is it possible to implement something like
int main()
{
/* traditional way */
MyStruct s = {1, 2};
foo(&s); /* OK */
/* instead of declaring the local variable s, my_macro should
automatically create
a MyStruct variable onto the stack and return its address; is
that possible?
*/
foo(my_macro(1, 2)); /* How? Is that possible? */
}
Thanks,
j3d.
<gi************@agamura.comwrote in message
news:11**********************@r29g2000hsg.googlegr oups.com...Hi guys,
Given the following structure[...]
>
... end the following function[...]
>
is it possible to implement something like[...]
I have no idea why you want to do that. Anyhow, this is basically all I can
think of for now:
__________________________
typedef struct _MyStruct {
int a;
int b;
} MyStruct;
void foo(MyStruct *myStruct) {
}
#define MY_MACRO(mp_func, mp_sinit) { \
MyStruct Temp = mp_sinit(); \
foo(&Temp); \
}
int main(void) {
#define FOO_SINIT() {1, 2}
MY_MACRO(foo, FOO_SINIT);
return 0;
}
__________________________
Weird...
"Chris Thomasson" <cr*****@comcast.netwrote in message
news:-O******************************@comcast.com...
[...]__________________________
[...]
>
#define MY_MACRO(mp_func, mp_sinit) { \
MyStruct Temp = mp_sinit(); \
foo(&Temp); \
}oops! that should read as:
#define MY_MACRO(mp_func, mp_sinit) { \
MyStruct Temp = mp_sinit(); \
mp_func(&Temp); \
}
[...]__________________________Sorry for any confusion.
gi************@agamura.com wrote:Hi guys,
Given the following structure
typedef struct _MyStruct
{
int a;
int b;
} MyStruct;
... end the following function
void foo(MyStruct *myStruct)
{
...
}
is it possible to implement something like
int main()
{
/* traditional way */
MyStruct s = {1, 2};
foo(&s); /* OK */
/* instead of declaring the local variable s, my_macro should
automatically create
a MyStruct variable onto the stack and return its address; is
that possible?
*/
foo(my_macro(1, 2)); /* How? Is that possible? */
}Apart from Chris Thomasson''s suggestion, which has its own problems
(name clashes between the temporary variable and other variables; what
if you want to use the results of the call to foo()?; etc.), I can think
of no way to do what you want in C.
Perhaps you''d like to explain what you are trying to achieve and we may
have some other suggestions.
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