How to declare and define class member functions separately using template.
Feb 22, 2017 at 8:57pm UTC
Hi, I am trying to write a template class, in which member functions are declared with class definition and defined outside class definition.
But getting the following error :
genStack.cpp:44:3: error: prototype for ‘T Stack<T>::push(const T&)’ does not match any in class ‘Stack<T>’
T Stack<T>::push(const T &x)
^~~~~~~~
genStack.cpp:36:14: error: candidate is: void Stack<T>::push(const T&)
void push(const T &x);
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#include <iostream>
#include <vector>
#include <cstring>
using namespace std;
template <typename T>
class Stack
{
private :
vector<T> arr;
int index;
public :
Stack(size_t size)
{
arr.resize(size);
index = 0;
}
virtual ~Stack() {}
T pop() //THIS DEFINITION WORKS FINE
{
if (index == 0)
cout << "Stack empty \n" ;
else
{
--index;
return arr.at(index);
}
return T(-1);
}
void push(const T &x);
/* {
arr.at(index++) = x;
return;
}*/
};
template <typename T>
T Stack<T>::push(const T &x) //THIS DEFINITION GIVES ERROR
{
arr.at(index++) = x;
return ;
}
int main()
{
Stack<int > iStack(10);
for (int i = 0; i < 10; ++i)
iStack.push(i);
return 0;
}
Last edited on Feb 22, 2017 at 9:00pm UTC
Feb 22, 2017 at 10:01pm UTC
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T Stack<T>::push(const T&)
void Stack<T>::push(const T&)
¿do you see the difference?
Suppose that T=double
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double Stack<double >::push(const double &)
void Stack<double >::push(const double &)
¿do you see the difference?
Feb 23, 2017 at 4:50am UTC
Thanks @ne555 for pointing that out :)
Wat a silly mistake :(
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