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#include <iostream>
#include <cstdlib>
using namespace std;
//
template <class Type> class q_demo;
//
class project_engineer{
string first_name;
string last_name;
string project;
int id;
public:
void set_engineer(string,string,string,int);
void get_engineer(string*,string*,string*,int*);
project_engineer(string init_first = "John",
string init_last = "Smith",
string init_project = "Tahoe",
int init_id = 7)
{
first_name = init_first;
last_name = init_last;
project = init_project;
id = init_id;
}
void show_engineer();
};
//
void project_engineer::set_engineer(string first ,string last ,
string proj_name ,int engin_id )
{
first_name = first;
last_name = last;
id = engin_id;
}
//
void project_engineer::show_engineer()
{
cout << "Hello project_engineer \n" << "\n";
cout << first_name << " " <<
last_name << " " <<
project << " " <<
id;
}
//*******************************
//**** end class projec_engineer
//*******************************
//
//*******************************
//**** begin class q_object
//*******************************
template <class Type>
class q_object{ // p815 5th class QueueItem
public:
friend class q_demo<Type>;
q_object( const Type&);
Type get_object()
{
return object;
}
//
q_object* get_next()
{
return next;
}
private:
Type object;
q_object *next;
};
// **
// The execution of a constructor is done in two phases
// initialization and assignment. The {..} contain the assignment
// when it is null {} there is no assignment phase.
//
//
template <class Type>
q_object<Type>::q_object(const Type &t) : object(t)
{next = 0;}
//
//*****************************************
// end q_object **
//*****************************************
//*****************************************
//*** begin q_demo
//***
//***
//
//
template <class Type>
class q_demo{
private:
q_object<Type> *front;
q_object<Type> *back;
public:
q_demo() {front = 0; back = 0;}
~q_demo();
//
q_object<Type>* get_front()
{
return front;
}
void remove(bool&);
void add(const Type&);
bool is_empty() {
return front==0 ? true : false;}
};
//
template <class Type>
void q_demo<Type>::remove(bool& fail)
{
fail = false;
if (is_empty() == true)
{
fail = true;
cout << "ERR remove() on an empty queue \n";
}
if (is_empty() == false)
{
q_object<Type> *pt = front;
front = front->next;
//Type retval = pt->q_object;
delete pt;
//return retval;
}
}
//
template <class Type>
q_demo<Type>::~q_demo()
{
while (! is_empty() == false)
remove();
cout << "destructor q_demo \n";
}
//
template <class Type>
void q_demo<Type>::add(const Type &ob_val)
{
//cout << "Hello add \n";
q_object<Type> *pt = new q_object<Type>(ob_val);
if (is_empty())
{
front = pt;
back = pt;
}
else
{
back->next = pt;
back = pt;
}
}
//
//
int main ()
{
project_engineer ob1_prj_eng("Jane", "Smith", "Solano", 96);
q_object<project_engineer> ob1_q_object(ob1_prj_eng);
//q_demo<project_engineer> ob2_q_demo();
//
cout << "Hello queue world \n";
//**************************************
q_demo<project_engineer> *p2q_demo = new q_demo<project_engineer>;
//
p2q_demo->add(ob1_prj_eng);
ob1_prj_eng.set_engineer("John ", "Lantz ", "Tahoe ", 3456);
p2q_demo->add(ob1_prj_eng);
ob1_prj_eng.set_engineer("Sally ","Brown ","Reno ", 1000);
p2q_demo->add(ob1_prj_eng);
ob1_prj_eng.set_engineer("Joan ","White ","Reno ", 1050);
p2q_demo->add(ob1_prj_eng);
ob1_prj_eng.set_engineer("Pauline ","Richard ","Redwood ", 99);
p2q_demo->add(ob1_prj_eng);
//
q_object<project_engineer> *p2front = p2q_demo->get_front();
project_engineer ob_temp = p2front->get_object();
ob_temp.show_engineer();
//*********************
q_object<project_engineer> *p2next = p2front->get_next();
ob_temp = p2next->get_object();
ob_temp.show_engineer();
//**********************
p2next = p2next->get_next();
ob_temp = p2next->get_object();
ob_temp.show_engineer();
//**********************
p2next = p2next->get_next();
if (p2next == 0)
{
cout << "next is 0 :: End of queue \n";
}
if (p2next != 0)
{
ob_temp = p2next->get_object();
ob_temp.show_engineer();
}
//**********************
p2next = p2next->get_next();
//**********************
if (p2next != 0)
{
ob_temp = p2next->get_object();
ob_temp.show_engineer();
}
if (p2next == 0)
{
cout << "End of queue \n";
}
//**********************
cout << "Calling remove \n";
bool fail=false;
p2q_demo->remove(fail);
p2front = p2q_demo->get_front();
ob_temp = p2front->get_object();
ob_temp.show_engineer();
system("pause");
return 0;
}
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