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Definition of constant object of class
class MojaKlasa{
public:
};

int main()
{
  const MojaKlasa a;

  return 0;
}

error: uninitialized const ‘a’

class MojaKlasa{
public:
  MojaKlasa(){}
};

$ clang++ -std=c++0x -pedantic -Wall t.cpp
t.cpp:7:19: error: default initialization of an object  of const type
                   'const MojaKlasa' requires a user-provided default constructor
  const MojaKlasa a;
                  ^
1 error generated.