following code comipling perfectly but showing runtime error . why?

Posted by user323422 on Stack Overflow See other posts from Stack Overflow or by user323422
Published on 2010-04-30T09:04:59Z Indexed on 2010/04/30 9:07 UTC
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//sample.h

int calci(int &value)
{
   if(value < 20)
    throw value;
   else
     return value;
}

class XYX
{
   int m_x;
   public: XYZ(int &x)try:m_x(a-calci(x))
          {
          }catch (int &a)
          {}

};
class ABC
{
   int m_a;
   public: ABC():m_a(0)
   {
   }
    void foo()
    {
        XYZ xyz(10);


    }
};




int main()
{
   ABC abc;
   abc.foo();
}

//if i replace foo() with following code then it works well

void foo()
{
  try{
    XYZ xyz(10);
  }catch(...){}
}

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