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Template with OO caused unresolved external symbol issue


Template with OO caused unresolved external symbol issue

By : user2951372
Date : November 18 2020, 01:01 AM
this one helps. It's your static variable in your class. You only declare it in your header but you also need to define it in your cpp file. That means you will have to include your template static member in the cpp.
E.g. in your cpp file do this:
code :
template <class T>
SQLiteHelper<T>* SQLiteHelper<T>::m_sInstance;


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Template class - unresolved external symbol(s)

Template class - unresolved external symbol(s)


By : user2995975
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Put the implementation (your method definitions) into the header along with the class declaration (see this in the C++ FAQ). Some compilers have supported an "export" keyword for doing it the way that you did, but that has been nixed in the C++0x.
Unresolved External Symbol -- Template Class

Unresolved External Symbol -- Template Class


By : Chalo_RC
Date : March 29 2020, 07:55 AM
it helps some times Move the contents of SelectionSort.cpp to SelectionSort.h, just below the class declaration. Also ensure that you have a header guard around the contents of your entire .h file.
The problem comes from how C++ implements templates. Every time it sees a new type used with a template class (like Selection), it recreates the entire class, replacing ItemType with int.
Unresolved External Symbol when initializing pointer to a template

Unresolved External Symbol when initializing pointer to a template


By : Sathish
Date : March 29 2020, 07:55 AM
wish help you to fix your issue If stack1 is supposed to be a data member of Weapon (and not a function), you should declare this as:
code :
class Weapon :
    public GameObject
{
public:
    Weapon(int);
    ~Weapon(void);

    Stack <Round>   stack1;
    Weapon *next;

    void display();
};
Weapon::Weapon(int size) : stack1(size)
{ }
Unresolved external symbol with template function

Unresolved external symbol with template function


By : nickrantaro
Date : March 29 2020, 07:55 AM
should help you out C++ does not allow you to declare a template in a header file and define it in a .cpp file. The reason is that templates can only be created when the template parameters are known and so they can't be complied in advance.
To solve your problem, you will need to declare and define template T GetAsset(string assetName) in the AssetManager.h file
error LNK2019: unresolved external symbol template

error LNK2019: unresolved external symbol template


By : M. McK
Date : March 29 2020, 07:55 AM
around this issue You have to move the implementation of the functions which uses template out of .cpp and put it into header file(.h)
template functions and classes should be implemented in header file (.h).
code :
#ifndef Header_h
#define Header_h

#include<iostream>
using namespace std;
typedef int BOOL;
#define TRUE 1
#define FALSE 0

template <class t>
class searching
{
    private :
    t *ptr;
    int isize;
    BOOL sort;

    public:
    searching(int into){
        isize =into;
        ptr= new t [isize];
    }
    searching(searching &ref)
    {
        isize=ref.isize;
        ptr=new t[isize];

        for(int i=0;i<isize;i++)
        {
            ptr[i]=ref.ptr[i];
        }
    }
    ~searching(){
        delete []ptr;
    }


    BOOL linearsearch(t value){
        int i=0;
        for(i=0;i<isize;i++)
        {
            if(ptr[i]==value)
            break;
        }
        if(i==isize)
        {
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }


    void set_data(){
        cout<<"Enter "<<isize<<" element"<<endl;
        for(int i=0;i<isize;i++)
        {
            cin>>ptr[i];
        }
    }
    void get_data(){
        cout<<"Eelements are :"<<endl;
        for(int i=0;i<isize;i++)
        {
            cout<<ptr[i]<<endl;
        }
    }

};
#endif /* Header_h */
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