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#include <vector>
#include <string>
#include <iostream>
#include <string>
#include <xutility>
using std::string;
using std::vector;
using std::size_t;
using std::ostream;
using std::max;
using std::endl;
class Picture;
Picture frame( Picture& pic );
class Element{
friend class Picture;
friend class Frame;
friend class HMerge;
friend Picture frame( Picture& pic );
friend ostream& operator<<( ostream& out, Picture& pic );
public:
virtual ~Element(){
std::cout << "~Element()" << std::endl;
};
protected:
virtual void draw(ostream&, size_t)=0;
virtual size_t width()=0;
virtual size_t rows()=0;
private:
};
class Text:public Element{
friend class Picture;
public:
~Text(){
std::cout << "~Text()" << std::endl;
};
protected:
Text( const vector<string>& text ):text(text){}
void draw( ostream & out, size_t row ){ out << text[row] << string( width() - text[row].length(), ' ' ); }
size_t width(){ size_t width=0; for( size_t row = 0; row != text.size(); ++row ) width = max( width , text[row].length() ); return width; }
size_t rows(){ return text.size();}
private:
vector<string> text;
};
class Frame:public Element{
friend Picture frame( Picture& pic );
public:
~Frame(){
std::cout << "~Frame()" << std::endl;
if(ptr) delete ptr;
ptr = 0;
}
protected:
Frame( Element* ptr ):ptr(ptr){}
void draw( ostream& out, size_t row )
{
if( row == 0 || row == rows() - 1 ){ out << string( 2 + ptr->width() + 2, '*' ); }
else if( row == 1 || row == rows() - 2 ){ out << "*" + string( 1 + ptr->width() + 1, ' ' ) + "*";}
else if( row >= 1 && row <= rows() - 2 ){ out << string("* "); ptr->draw( out, row - 2 ); out << string(" *");}
}
size_t width(){ return 2 + ptr->width() + 2; }
size_t rows(){ return 2 + ptr->rows() + 2; }
private:
Element* ptr;
};
class HMerge : public Element{
friend void hMerge( Picture&, Picture& );
public:
~HMerge(){
std::cout << "~HMerge()" << std::endl;
if(lhs) delete lhs;
//if(rhs) delete rhs;
lhs = 0;
//rhs = 0;
}
protected:
HMerge( Element* lhs, Element* rhs ):lhs(lhs),rhs(rhs){}
void draw( ostream& out, size_t row )
{
if( row < lhs->rows() )
{
lhs->draw( out , row);
}
else
{
out << string( lhs->width() , ' ' );
}
if( row < rhs->rows() )
{
rhs->draw( out , row);
}
else
{
out << string( rhs->width() , ' ' );
}
}
size_t width(){ return lhs->width() + rhs->width(); }
size_t rows(){ return 2 + max( lhs->rows(), rhs->rows() ) + 2; }
private:
Element *lhs, *rhs;
};
/******************************PUBLIC INTERFACE***********************************/
class Picture{
friend void hMerge( Picture&, Picture&);
friend Picture frame( Picture& pic );
friend ostream& operator<<( ostream& out, Picture& pic );
public:
Picture( vector<string>& text ):ptr( new Text( text ) ){}
Picture( Picture& pic ):ptr( pic.ptr ){}
Picture( Element* ptr):ptr(ptr){}
~Picture(){
std::cout << "~Picture()" << std::endl;
if(ptr) delete ptr;
ptr=0;
}
operator Element* (){ return ptr; }
private:
Element * ptr;
};
Picture frame( Picture& pic ){
return new Frame( pic.ptr );
}
void hMerge( Picture& lhs, Picture& rhs ){
lhs.ptr = new HMerge( lhs.ptr, rhs.ptr );
}
ostream& operator<<( ostream& out, Picture& pic )
{
for( size_t row = 0 ;
row != pic.ptr->rows() ;
++row )
{
pic.ptr->draw( out , row );
out << endl;
}
return out;
}
int main(){
std::vector<std::string> v;
v.push_back( "Hallo" );
v.push_back( "Josef!" );
Picture p = v;
Picture q = frame( p ); //ERROR: after the assigment q holds only rubbish!!
std::cout << q << std::endl;
}
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