נושא: c++

void CalcArea() { //8

        area_ = 0;

        vector<Point>::iterator i; //9

        for( i = points_.begin(); i != points_.end(); ++i )

          area_ += /* some work */;

      }

פתרון 5

void CalcArea()   const {

            area_ =     0;

            vector<Point>::const_iterator i;

            for( i = points_.begin(); i   != points_.end(); ++i )

                  area_ += /* some work */;

      }

מקרה 6

Polygon operator+( Polygon& lhs, Polygon& rhs ) { //10, 11

      Polygon ret = lhs;

      int last = rhs.GetNumPoints(); //12

      for( int i = 0; i < last; ++i ) // concatenate

        ret.AddPoint( rhs.GetPoint(i) ); //12a

      return ret;

    }

פתרון 6

const Polygon operator+( const Polygon&   lhs, const Polygon& rhs ) {

      Polygon     ret   = lhs;

      const int last = rhs.GetNumPoints();

      for( int i = 0;   i <   last; ++i ) // concatenate

            ret.AddPoint( rhs.GetPoint(i) );

    return ret;

}

מקרה 7

void f( const Polygon& poly ) { //12b

      const_cast<Polygon&>(poly).AddPoint( Point(0,0) );

    }

    void g( Polygon& const rPoly ) { //13

      rPoly.AddPoint( Point(1,1) );

    }

    void h( Polygon* const pPoly ) { //14

      pPoly->AddPoint( Point(2,2) );

    }

פתרון 7

void f(Polygon& poly )  {poly.AddPoint(Point(0,0) );}

void g(Polygon& rPoly ) { rPoly.AddPoint(Point(1,1) ); }

void h(Polygon* pPoly ) { pPoly->AddPoint(Point(2,2) ); }

תודה