#include <iostream>
using std::cout;
using std::endl;
#define Charizing(x) #@x
int main()
{
cout << Charizing(a) << endl;
cout << Charizing(b1) << endl;
}
First, let's study above program. The output is
a
25137
Basically, Charizing(x) encloses the parameter x with single quotation mark and treats it as a character. That's why Charizing(a) returns a. However, when x is not a character, the output is some strange number. I guess the number is converted from type of parameter to char.
However, the above program is not compilable in Xcode. The error is '#' is not followed by a macro parameter.
As far as I know, Stringizing operator (#) and Token-pasting operator (##) work fine on Xcode, except Token-pasting operator (##). According to MSDN, Token-pasting operator (##) is a Microsoft specific. This is why it is not supported in Xcode.
To fix the program to work on both Windows and MAC OSX, we can first convert the parameter x to string and then get the first character. We suppose that x always contains one character with "#x[0]".
#include <iostream>
using std::cout;
using std::endl;
#define Charizing(x) #x[0]
int main()
{
cout << Charizing(a) << endl;
cout << Charizing(b1) << endl;
}
