This is a quick tip in C++ for providing support for optional parameters on functions. This works because when a function is declared in C++ it can be given a default value and when that parameter is missing from the calling function the compiler will automatically add it during compile time and pass the default value.

Here is a simple example of this.

#include <stdio.h>

bool func(bool val = false) {
    return val;
}


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

    printf("%d\n", func());
    printf("%d\n", func(false));
    printf("%d\n", func(true));

    return 0;
}