Message-ID: <36C8A212.2450C0CB@bignet.net>
From: John Soares <moose AT bignet DOT net>
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Subject: Displaying binsrch tree contents
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Date: Mon, 15 Feb 1999 14:39:14 -0800
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

I am using templates to manipulate different kinds of tree data. For my
project, I have an employee info tree and a project info tree. I am able
to insert and retrieve from each tree with no problems.

When I did projects that required only one tree, I used to be able to
display the contents of each node by simply pointing to a display
function. Now it seems I cannot do this, but I'm probably just missing
something. Here is my code:


//implementation file..this function has worked fine before I used
templates

template <class S>
void treeNode<S>::PreorderTraverse(functionType Visit)
{
 Preorder(Root, Visit);
}


template <class S>
void treeNode<S>::Preorder(ptrType TreePtr, functionType Visit)
{

 if (TreePtr != NULL)
 {
  Visit(TreePtr->Item);
  Preorder(TreePtr->LChildPtr, Visit);
  Preorder(TreePtr->RChildPtr, Visit);
 }
}


//driver file

//I simply want to display each employee with all his
information..employee number,
//name, skills, etc. and then compare employee skills with each project
and the skills
//it requires

void EmpTree_Display(treeNode <employee> & e)
{
 cout << endl << "here is employee nbr: " << e << endl;
}

void assn_emp_to_project(treeNode<employee> employee_tree,
                                         treeNode<project> project_tree)

{
 //assuming that employee must have all skills the project calls for
 //Have to get to the first project in the tree..also the first
 //employee. Then traverse project tree until done or you find a project

 //for employee.

 cout << "into assn emp";

 employee emp;

 employee_tree.RootData();

 employee_tree.PreorderTraverse(&EmpTree_Display);

 exit(0);

 return;
}


When I try to compile the program, I get these syntax errors:

121p4drv.cpp: In function `void EmpTree_Display(class treeNode<employee>
&)':
121p4drv.cpp:304: no match for `ostream & << treeNode<employee> &'
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:77:
candidates are: ostream::operator <<(char)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:78:
ostream::operator <<(unsigned char)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:79:
ostream::operator <<(signed char)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:80:
ostream::operator <<(const char *)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:82:
ostream::operator <<(const unsigned char *)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:84:
ostream::operator <<(const signed char *)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:85:
ostream::operator <<(const void *)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:86:
ostream::operator <<(int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:87:
ostream::operator <<(unsigned int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:88:
ostream::operator <<(long int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:89:
ostream::operator <<(long unsigned int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:91:
ostream::operator <<(long long int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:92:
ostream::operator <<(long long unsigned int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:94:
ostream::operator <<(short int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:95:
ostream::operator <<(short unsigned int)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:97:
ostream::operator <<(bool)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:99:
ostream::operator <<(double)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:100:
ostream::operator <<(float)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:104:
ostream::operator <<(long double)
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:106:
ostream::operator <<(ostream & (*)(ostream &))
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:107:
ostream::operator <<(ios & (*)(ios &))
C:\\EGCS\\BIN\\..\\lib\\gcc-lib\\i386-mingw32\\egcs-2.91.60\\..\\..\\..\\..\\include\\g++\\iostream.h:108:
ostream::operator <<(streambuf *)
121p4drv.cpp: In function `void assn_emp_to_project(class
treeNode<employee>, class treeNode<project>)':
121p4drv.cpp:319: no matching function for call to
`treeNode<employee>::PreorderTraverse (void (*)(treeNode<employee> &))'
121-P4~1.cpp:153: candidates are:
treeNode<employee>::PreorderTraverse<employee>(void (*)(employee &))


///////////

Does anything jump out at anyone that I am doing wrong here? This used
to work with just a single tree, but now that I am using templates, it
does not. Any hints appreciated.

John