In C, it’s common to define macros that do some stuff getting the verbatim argument, and at the same time define functions to be able to get the address of it transparently.
// could evaluate at compile time if __builtin_sin gets
// special treatment by the compiler
#define sin(x) __builtin_sin(x)
// parentheses avoid substitution by the macro
double (sin)(double arg) {
return sin(arg); // uses the macro
}
int main() {
// uses the macro
printf("%f\n", sin(3.14));
// uses the function
double (*x)(double) = &sin;
// uses the function
printf("%f\n", (sin)(3.14));
}