What are some tricks I can use with macros? [closed]

by

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));
}

Leave a Comment