/in/foo.cc: In function 'int main()':
/in/foo.cc:23:3: error: 'memset' was not declared in this scope
   memset(f, 0, sizeof f);
   ^~~~~~
/in/foo.cc:23:3: note: suggested alternative: 'wmemset'
   memset(f, 0, sizeof f);
   ^~~~~~
   wmemset