hi, i'm trying to write an overloaded stream insertion operator for a class who's only member is a vector.
i
dont really know what i'm doing. (lets make that clear)
it's a vector of "Points" which is a struct containing two doubles.
i figure what i want is to insert user input (a bunch of doubles) into a stream that i then send to a modifier method?
i keep working off other stream insertion examples such as...
std::ostream& operator<< (std::ostream& o, Fred const& fred)
{
return o << fred.i_;
}
but when i try a similar.....
istream & operator >> (istream &inStream, Polygon &vertStr)
{
inStream >> ws;
inStream >> vertStr.vertices;
return inStream;
}
i get an error "no match for operator etc etc.
if i leave off
the .vertices it compiles but i figure it's not right?
(vertices is
the name of my vector )
and even if it is right, i
dont actually know what syntax to use in my driver to use it?
also not %100 on what my modifier method needs to look like.
here's my Polygon class
//header
#ifndef POLYGON_H
#define POLYGON_H
#include "Segment.h"
#include <vector>
class Polygon
{
friend std::istream & operator >> (std::istream &inStream, Polygon &vertStr);
public:
//Constructor
Polygon(const Point &theVerts);
//Default Constructor
Polygon();
//Copy Constructor
Polygon(const Polygon &polyCopy);
//Accessor/Modifier methods
inline std::vector<Point> getVector() const {return vertices;}
//Return number of Vector elements
inline int sizeOfVect() const {return (int) vertices.capacity();}
//add Point elements to vector
inline void setVertices(const Point &theVerts){vertices.push_back (theVerts);}
private:
std::vector<Point> vertices;
};
#endif
//Body
using namespace std;
#include "Polygon.h"
// Constructor
Polygon::Polygon(const Point &theVerts)
{
vertices.push_back (theVerts);
}
//Copy Constructor
Polygon::Polygon(const Polygon &polyCopy)
{
vertices = polyCopy.vertices;
}
//Default Constructor
Polygon::Polygon(){}
istream & operator >> (istream &inStream, Polygon &vertStr)
{
inStream >> ws;
inStream >> vertStr;
return inStream;
}
any help greatly appreciated,
sorry to be so vague, a lecturer has just kind of given us a brief example of stream insertion then left us on our own
thanks.
oh i realise there are probably many other problems that need fixing
