Hur kan man använda Remove_if algoritmen med en vector?

[colper89]

Hej !
Jag har det svårt att bygga sista puzzelbiten i min uppgift given till mig. Problemet ligger i remove_if (algoritmen). Detta är kod som är givet till mig:

main.cpp
[kod]
int main() {
vector<ShapePtr> shapevec;
Vertex varr[] = { Verte0,0), Verte10,0), Verte5,2), Verte5,5)};
shapevec.push_back( ShapePtr(new Polygon(1, 4, varr, 4)) );
shapevec.push_back( ShapePtr(new Circle(5, 5, 4)) );

ofstream os("fildat.txt");
ostream_iterator<const ShapePtr> shapeout(os, "\n");
copy(shapevec.begin(), shapevec.end(), shapeout);
os.close();

ifstream is("fildat.dat");
istream_iterator<ShapePtr> shapein(is), endofshapein;
list<ShapePtr> shapelist(shapein, endofshapein );
for (list<ShapePtr>:terator it = shapelist.begin(); it != shapelist.end(); it++)
cout << *it << endl;

shapevec.insert( shapevec.end(), shapelist.begin(), shapelist.end() );
shapevec.erase(remove_if( shapevec.begin(), shapevec.end(), CloseTo( Verte6,7))), shapevec.end());

return 0;
}
[/kod]

Här är det kod som jag har skrivit i relevans till problemet:
ShapePtr.h
[kod]
class ShapePtr{
protected:
Shape* ShpPtr;

public:
static int numshapes;
ShapePtr(): ShpPtr(0){}
ShapePtr(Shape *sT) {ShpPtr = sT->clone(); delete sT;}

ShapePtr(const ShapePtr &ptr);
~ShapePtr();

friend ostream& operator<<( ostream &os, const ShapePtr &baseptr);
friend istream& operator>>( istream &is, ShapePtr &baseptr);
};
[/kod]

ShapePtr.cpp
[kod]
int ShapePtr::numshapes = 0;

ShapePtr::ShapePtr(const ShapePtr &ptr){
cout << "\tShapePtr_constructor_Pointer_Begin" << endl;
if(ptr.ShpPtr != 0){
ShpPtr = ptr.ShpPtr->clone();
numshapes = Shape::cs;
cout << "\t numshapes= " << numshapes << endl;
} else{
ShpPtr = 0;
}
cout << "\tShapePtr_constructor_Pointer_Finish" << endl;
}

ShapePtr::~ShapePtr(){
cout << "\t\tShapePtr_destructor" << endl;
if ( ShpPtr != 0 ){
delete ShpPtr;
}
ShpPtr = 0;
}


ostream& operator<<( ostream &os, const ShapePtr &baseptr) {
os << *baseptr.ShpPtr;
return os;
}

istream& operator>>( istream &is, ShapePtr &baseptr) {
string shpe;
if (!(is >> shpe))
return is;
Shape *b = 0;
if ( shpe == "CIRCLE" )
b = new Circle();
else if ( shpe == "POLYGON" )
b = new Polygon();
is >> *b;
baseptr.ShpPtr = b->clone();
delete b;
return is;
}
[/kod]

Vertex.h
[kod]
class Vertex {

private:
int x, y;

public:
Verte): 0), y(0){}
Verteint _X, int _Y): _X), y(_Y){}
~Verte);

const int Xv() { return x; }
const int Yv() { return y; }
const void Xin(int X_in ) { x = X_in; }
const void Yin(int Y_in ) { y = Y_in; }
};
[/kod]

Problemet är att jag inte förstår hur jag kan bygga metoden "CloseTo()" i main.cpp. Jag har svårt att få detta att fungera:

[kod]shapevec.erase(remove_if( shapevec.begin(), shapevec.end(), CloseTo( Verte6,7))), shapevec.end());[/kod]

Kan någon hjälpa mig eller guida mig till en förklaring (helst tips) till vad jag kan göra?