So I am currently working on a project to make a library with all of the different data structures in C . Here I have declared a class Bag:

template<typename Type>
class Bag
{
    // ...
    inline static const char* print_seperator = "\n";

public:

    // ...
    inline static void set_seperator(const char* new_seperator)
    {
        Bag::print_seperator = new_seperator;
    }
}

Now this works fine, but when I try to use it in my main() function like this:

sgl::Bag::set_seperator(", ");

This shows the following error:

Argument list for class template sgl::Bag is missing

..so I gave the argument list for the class template:

sgl::Bag<int>::set_seperator(", ");

..and it works fine.

But I don't want to type that out every time. Is there any way I can overcome this?

CodePudding user response：

You can use default template argument for the template type parameter Type as shown below:

//use default argument for template type parameter "Type"
template<typename Type = int>
class Bag
{
    // ...
    inline static const char* print_seperator = "\n";

public:

    // ...
    inline static void set_seperator(const char* new_seperator)
    {
        Bag::print_seperator = new_seperator;
    }
};
int main()
{
    //no need to specify int
    Bag<>::set_seperator(", "); //angle bracket still needed  
    return 0;
}

Demo