Re: ld returned 1 exit status Error

---------------
Vector.h
--------------

#ifndef VECTOR_H_
#define VECTOR_H_

         #include <iostream>
         #include <stdlib.h>

using namespace std;

namespace ptl
{
         template <class T>
         class vec
         {
         private:
                 T* ptr;
                 T* allocate(int);

         public:
                 //structor
                 vec():ptr(NULL){
                         cout << "No arg constructor" << endl;
                 };

                 vec(int val):ptr(NULL){
                         cout << "one arg constructor" << endl;
                         ptr = allocate(sizeof(int));
                         *ptr = val;
                 };

                 ~vec(){};

         };

}//namespace ptl

#endif /*VECTOR_H_*/

---------------
vector.cpp
--------------
#include "vector.h"

template <class T>
T* ptl::vec<T>::allocate(int size)
{
         T *tmp = (T*)malloc(size);
         cout << "allocate fn" << endl;
         return tmp;

}

--------------------------------------------------------------
But when I put the code in vector.cpp to vector.h its gets compiled.