c++ default parameters -

possible duplicate:
nonstatic member default argument of nonstatic member function

ok. i'm having problems understanding how accomplish seemingly simple task... here want accomplish:

#include <iostream>  using namespace std;  class a{ private:     int _x; public:     a(int x){         _x = x;     }      void test(int x=_x){         cout << x << endl;     } };  int main(){     a(3);     a.test(); } 

the compiler complains int x=_x part saying error: invalid use of non-static data member a::_x

so how use default parameter this?

thanks.

you can't that.

you can have overload test takes no parameters.

void test(){     test(_x); }