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problem in destroying all elements of a binary search tree

uytoor2 (9)
why is it giving error ?
[Error] undefined reference to `tree<int>::destroy(node<int>*)'
[Error] collect2: ld returned 1 exit status

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 template<class T>
void destroy(node<T> *root) 
{   
    if(root ==0 )
    return;
    else
	{
	
       if(root->left==0  && root->right==0)  
       delete root; 
       delete(root->left);
       delete(root->right);
    
    }  
}



function call:
 
 
obj.destroy(obj.root);


prototype:
 
 
void destroy(node<T>*);
JLBorges (13770)
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template<class T>
// void destroy(node<T> *root) 
void tree<T>::destroy( node<T>* root ) 
{
    // ...
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