Weird Errors

[TamaThps]

Hi, I'm using visual studio 2008 and normally when I get an error it shows what line it is on and which file etc. The error I'm getting I don't know how to solve or even what the problem is. This is the whole output when I try to run the program.
"1>------ Build started: Project: corysid, Configuration: Debug Win32 ------
1>Compiling...
1>implementatio n.cpp
1>Linking...
1>actualmain.ob j : error LNK2019: unresolved external symbol "public: __thiscall SortedList<floa t>::SortedList< float>(void)" (??0?$SortedLis t@M@@QAE@XZ) referenced in function _main
1>actualmain.ob j : error LNK2019: unresolved external symbol "public: __thiscall SortedList<char >::SortedList<c har>(void)" (??0?$SortedLis t@D@@QAE@XZ) referenced in function _main
1>C:\projectscp p\corysid\Debug \corysid.exe : fatal error LNK1120: 2 unresolved externals
1>Build log was saved at "file://c:\projectscpp\ corysid\corysid \Debug\BuildLog .htm"
1>corysid - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped =========="

I'm using a class template, and it seems it cannot access parts of the class when I make an instance of the class?

Here's the code if that helps
.h file:

#define MAX_ITEMS  20
 
template<class ItemType>
class SortedList
{ 
       private:
        int length;
        ItemType values[MAX_ITEMS];
        int currentPos;
       public:
         SortedList( );  // default constructor: lenght=0, currentPos=-1
         void MakeEmpty();    // let length=0
         void InsertItem(ItemType x);   // insert x into the list     
         void DeleteItem(ItemType x);  // delete x from the list
         bool IsFull( );        // test if the list is full
         int LengthIs( );   // return length
         void RetrieveItem(ItemType &x, bool &found);            // retrieve x from the list, the 
                                                                // boolean result is stored in found
         void ResetList( );  // currentPos=-1
         void GetNextItem(ItemType &x);                        // get the next element from the list with 
                                                            // respect to the currentPos
         int numCharElement();
         int numFloatElement();
};

Implementation:

#include <fstream>
#include <iostream>
#include "part2.h"
using namespace std;
 
 
template<class ItemType>
SortedList<ItemType>::SortedList()
{
    length = 0;
    currentPos= -1;
}
 
template<class ItemType>
void SortedList<ItemType>::MakeEmpty()
{
    length=0;
}
 
template<class ItemType>
void SortedList<ItemType>::InsertItem(ItemType x)
{
 
    int midpoint;
    int first=0;
    int last= length-1;
    midpoint = (first+last)/2;
 
    bool moreToSearch = (first <= last);
    found = false;
    while(moreToSearch)
    {
        switch(x.comparedTo(values[location]))
        {
        case LESS:    //search in 1st half
            moreToSearch = (first <= last);
            last= midpoint-1;
            break;
        case GREATER:
                location ++;
                moreToSearch=(location<length);
                break;
        }
    }
for (int index=length; length>location; index--)
{    
    values[index]= values[index-1];
}
    values[location] =x;
    length++;
 
}
 
 
template<class ItemType>
void SortedList<ItemType>::DeleteItem(ItemType x)
{
    int midpoint;
    int first=0;
    int last= length-1;
    midpoint= (first+last)/2
 
    bool moreToSearch = (first <= last);
    found = false;
    while(moreToSearch)
    {
        switch(x.comparedTo(values[location]))
        {
        case LESS:    //search in 1st half
            moreToSearch = (first <= last);
            last= midpoint-1;
            break;
        case GREATER:
                location ++;
                moreToSearch=(location<length);
                break;
        }
    }
for (int index=length; length>location; index--)
{    
    values[index]= values[index-1];
}
    values[location] =x;
    length++;
 
}
 
template<class ItemType>
void SortedList<ItemType>::RetrieveItem(ItemType &x, bool &found)
{
    int midpoint;
    int first=0, last=length-1;
    bool moreToSearch= (first <= last);
    found= false;
    while(moreToSearch && !found)
    {
        midpoint=(first+last)/2
        switch(x.comparedTo(values[index]))
        {
        case LESS:        //search in 1st half
            moreToSearch= (first <= last);
            last= midpoint-1;
            break;
        case GREATER;    //Search in 2nd half
            first= midpoint+1;
            moreToSearch = (first <=last);
            break;
        case EQUAL;        //x has been found
            found= true;
            break;
        }
    }
}
 
template<class ItemType>
int SortedList<ItemType>::LengthIs()
{
    return length;
}
 
template<class ItemType>
void SortedList<ItemType>::ResetList()
{
    currentPos= -1;
}
 
template<class ItemType>
bool SortedList<ItemType>::IsFull()
{
    if (length < 19)
        return false;
    else
        return true;
}
 
template<class ItemType>
void SortedList<ItemType>::GetNextItem(ItemType &x)
{
    currentPos++; 
    item = values [currentPos]; 
}
 
template<class ItemType>
int SortedList<ItemType>::numCharElement()
{
    indata.open("char.dat");
 
    int i=0; 
    int size=0;
 
    char values[20];
    while (indata.eof())        // write or read data from indatac into values
    {    
    indata >> values[i];            
    i++;
    size++;                    // this will count how many values there are in the array
    }    
 
    for(i=0; i<size; i++)//just a test to see if it put the values in the array
    {
    cout<<values[i]<<endl;
    }
 
 
    for (int i=0; i< size; i++)    
    {            
 
    a.InsertItem (values[i]);        //and insterts each element into the list
    }
 
 
    cout << "There are "<< size << " items in the char array" << endl;        
 
 
    indata.close();
    return size;
 
 
}
 
 
 
template<class ItemType>
int SortedList<ItemType>::numFloatElement()
{
    int i=0; 
    int size=0;
    indata.open("float.dat");
 
    float values[20];
    while (!indata.eof())        // write or read data from indatac into values
    {    
    indata >> values[i];            
    i++;
    size++;                    // this will count how many values there are in the array
    }    
 
    for(i=0; i<size; i++)//just a test to see if it put the values in the array
    {
    cout<<values[i]<<endl;
    }
 
 
    for (int i=0; i< size; i++)    
    {                                    
    b.InsertItem (values[i]);        //and insterts each element into the list
    }
 
 
    cout << "There are "<< size << " items in the char array" << endl;        
 
 
    indata.close();
    return size;
 
 
}

Main function:

#include "part2.h"
#include <fstream>
#include <iostream>
using namespace std;
 
 
int main()
{
ifstream indata;
 
SortedList<char> a;
//a.numCharElement();
 
SortedList<float> b;
//b.numFloatElement();
return 0;
}

The code is supposed to call those 2 template functions and populate an array in sorted order. But I need to get past those weird errors to even try and debug the logic errors etc.

Thanks a lot.

[Savage]

When you are coding templates both definition and implementation must be in the same file.There are ways around it, but they are not worth it.

[TamaThps]

Thank you sir. I should be able to get it working now