#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// BROKEN: parentheses in the parameter list

//                             ▼▼
#define call_fn_with_logging(fn()) do { \
    printf("Entering %s\n", (#fn));   \
    fn();                             \
    printf("Leaving %s\n", (#fn));    \
} while(false)




void greet() {
    printf("Hey, hey!\n");
}

int main(int argc, char* argv[]) {

    call_fn_with_logging( greet );
    // We did not include parentheses here because line 11 (`fn();`) adds them for us.
    // In other words, when the call_fn_with_logging macro is expanded, the function
    // name greet will be followed by parentheses.
    
    return EXIT_SUCCESS;
}

/*
g.c:9:32: error: "(" may not appear in macro parameter list
 #define call_fn_with_logging(fn()) do { \
                                ^
g.c: In function ‘main’:
g.c:24:2: warning: implicit declaration of function ‘call_fn_with_logging’ [-Wimplicit-function-declaration]
  call_fn_with_logging( greet );
  ^~~~~~~~~~~~~~~~~~~~
 */
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