C/C에서 매크로 인수의 쉼표를 어떻게 처리합니까?

#define FOO(type, name) type name

FOO(int, int_var);

FOO(std::map<int, int>, map_var); // Error: 3 arguments passed to macro 'FOO', which takes only 2

typedef std::map<int, int> map_int_int_t;
FOO(map_int_int_t, map_var); // Compiles successfully

#define COMMA ,

FOO(std::map<int COMMA int>, map_var);

#include <cstdio>
#include <map>
#include <typeinfo>

#define STRV(...) #__VA_ARGS__
#define COMMA ,
#define FOO(type, bar) bar(STRV(type) \
    " has typeid name \"%s\"", typeid(type).name())

int main()
{
    FOO(std::map<int COMMA int>, std::printf);
}