所以,我经常使用 NSArrays,所以我决定尝试创建一个宏,该宏将根据此处的宏从传入的原语创建一个数组:
https://bitbucket.org/snej/myutilities/src/319441e240fa/CollectionUtils.h
#define $array(values...) ({ void *v[] = { values }; const char *encodings[] = { /* how do I get the @encode-ings for each? */ }; _boxArray(v, encodings, sizeof(values) / sizeof(void *))})
NSValue *_box(void *value, const char *encoding); // defined by CollectionUtils
NSArray *_boxArray(void **values, const char **encodings, int count)
{
id objects[count];
for (int i = 0; i < count; i++) {
// how can I box all of the values that need boxing?
objects[i] = _box(values[i], encodings[i]);
}
return [NSArray arrayWithObjects:objects count:count];
}
所以基本上,我要问的是,如何使用可变参数宏对传递给宏的每个参数执行操作?