Class 具有两个或更多模板重载

Question

Suppose I had a class that I wanted to declare with two "overloads", one that accepted 1 template parameter and another that accepted 2 like the pseudo code below:

template <typename I>
class B {
public:
};


template <typename F, typename I>
class B { 
};

such that B can be instantiated with only 1 or 2 parameters:

B<int> hello;
B<int, int> hello2;

What is the correct way to do this?

Answer 1

Simple answer:

template <typename... Args> // ellipsis makes Args a template parameter pack
class B
{
public:
};

int main()
{
    B<int> hello;
    B<int, int> hello2;
    B<int, int, double> hello3;
}

Now Args is called a template parameter pack .