define local function in c++

localfn.cpp

#define deflocal(name, ret, body) \
    struct name { \
        ret operator() body \
    }

#define callocal(name) name()
    
int main() {    
    // example
    deflocal(hello, char*, (const char *from, const char *to) {
        printf("%s say hello to %s\n", from, to);
        return "work";
    });

    
    char *r = callocal(hello)("kev", "she");
    printf("result: %s\n", r);
    
    return 0;
}