Question

Declaring boost::poor is something that goes as below.

boost::pool<> Obj();

I am curious how you can make a class template that needs no template parameters but only the <> ?

I tried making it as boost::pool does in pool.hpp and poolfwd.hpp.

template<class T>
class Fakepool { };  // pool.hpp

template<class T = int>
class Fakepool;   // boost::pool's declaration in poolfwd.hpp 

int main()
{
    Fakepool<float> a;

    Fakepool<> a2; // Can't do this with only <>
}//main()

Thanks in advance!

Answer 1

Is this what you are looking for?

template<class T = int>
class Fakepool { };

int main()
{
    Fakepool<float> a; // Use float

    Fakepool<> a2; // Default as int
}

You can also, do this (which I think is what you were thinking). The keyword here is default template arguments. However, in your example you defined the class before you declared it, which was the problem.

template<class T = int>
class Fakepool; 

template<class T>
class Fakepool { }; 

int main()
{
    Fakepool<float> a;

    Fakepool<> a2;
}