cctype and locale

[Erik Sigra]

Hello,
i read in my C++ book (The C++ Programming Language) that there is a function

        template <class Ch> bool isalpha(Ch c, const locale& loc);

Then I tried this with g++ 2.95.3:

#include <cctype>

int main() {
  locale loc("");
  return isalpha('a', loc);
}

The result was this:

$ gcc localetest.cc
localetest.cc:5: macro `isalpha' used with too many (2) args


What is wrong?