Container for a templated class

[rozick1]

Hi

Suppose I have a templated class like this:

template <typename T>
class MyTemplate {
    
    private:
        T thing;
        int num;
    
    public:
    
        MyTemplate(T t, int i) : thing(t), num (i) {}
    
};

I would like to have a container class which will have a member of type MyTemplate<T>. Is this just a matter of making the container class templated as well:

template <typename T>
class Container {
    
    private:
        bool someOtherMember = false;
        MyTemplate <T> element;
        
        
    public:
        Container(MyTemplate <T> t_element) : element(t_element) {}
    
};

I think this is the correct approach but grateful for any thoughts.

Thanks

[seeplus]

You'd probably want the arguments of MyTemplate and Container passed by const ref so that a copy isn't made.

template <typename T>
class MyTemplate {
private:
	T thing;
	int num;

public:
	MyTemplate(const T& t, int i) : thing(t), num(i) {}
};

template <typename T>
class Container {
private:
	bool someOtherMember = false;
	MyTemplate <T> element;

public:
	Container(const MyTemplate <T>& t_element) : element(t_element) {}
};

// ....

// Below OK depending upon version of C++! Argument deduction has changed between versions.

MyTemplate<double> t1 {3.1, 2};

Container<double> my1 {t1};

Container<double> my2 {{3.1, 2}};

MyTemplate t2 {4.2, 5};

Container my3 {t2};

Container my4 {MyTemplate{4.5, 6}};

[dhayden]

This is an xy problem: http://xyproblem.info/

Please explain the problem that you're trying to solve rather than asking about the solution that you've come up with.

[rozick1]

@dhayden - i've already explained the problem. what is the best way to design a container for a templated class? honestly, why do people get so pissy about things. say something nice or don't say anything at all.