小编che*_*spy的帖子

我从[https://www.scs.stanford.edu/~dm/blog/va-opt.html]获得了这个源代码。将 MSVC 与 C++20 一起使用它无法编译，但可以在其他编译器上编译。为什么？我该如何解决这个问题？

`/* compile with:
   c++ -std=c++20 -Wall -Werror make_enum.cc -o make_enum
 */

#include <iostream>

#define PARENS ()

// Rescan macro tokens 256 times
#define EXPAND(arg) EXPAND1(EXPAND1(EXPAND1(EXPAND1(arg))))
#define EXPAND1(arg) EXPAND2(EXPAND2(EXPAND2(EXPAND2(arg))))
#define EXPAND2(arg) EXPAND3(EXPAND3(EXPAND3(EXPAND3(arg))))
#define EXPAND3(arg) EXPAND4(EXPAND4(EXPAND4(EXPAND4(arg))))
#define EXPAND4(arg) arg

#define FOR_EACH(macro, ...)                                    \
  __VA_OPT__(EXPAND(FOR_EACH_HELPER(macro, __VA_ARGS__)))
#define FOR_EACH_HELPER(macro, a1, ...)                         \
  macro(a1)                                                     \
  __VA_OPT__(FOR_EACH_AGAIN PARENS (macro, __VA_ARGS__))
#define FOR_EACH_AGAIN() FOR_EACH_HELPER

#define ENUM_CASE(name) case name: return #name;

#define MAKE_ENUM(type, ...)                    \
enum type {                                     \
  __VA_ARGS__                                   \
};                                              \ …