如何正确使用模板？

Question

I am trying to create a vector class that looks something like this:

 template <typename T>
    class Vector
    {
     .
     .
     .
    };

    #include "vector.cpp"

However, when I start writing my functions in "vector.cpp", CLion complains that I have duplicate functions. How do I work around this? I believe in NetBeans, I can add vector.h & vector.cpp to a folder called "Important Files" which would fix the problem. I am not sure what the equivalent in CLion is.

Answer 1

General Design of a template

example.h

#ifndef EXAMPLE_H
#define EXAMPLE_H

// Needed includes if any

// Prototypes or Class Declarations if any

template<class T> // or template<typename T>
class Example {
private:
    T item_;

public:
    explicit Example( T item );
    ~Example();

    T getItem() const;
};

#include "Example.inl"

#endif // EXAMPLE_H

Example.inl

// Class Constructors & Member Function implementations

template<class T>
Example<T>::Example( T item ) : item_(item) {
}

template<class T>
Example<T>::~Example() {
}

template<class T>
T Example<T>::getItem() const { 
    return item_;
}

Example.cpp

#include "Example.h"

// Only need to have the include here unless if 
// the class is non template or stand alone functions
// are non-template type. Then they would go here.