Function with single optional parameter and default value in template function

I want a function with has only 1 argument which is optional with generic type and has assigned boost::none as default value. Is that possible?

#include <iostream>
#include <string>
#include <boost/optional.hpp>

template <typename T>
void f(boost::optional<T> v = boost::none)
{
    if (v)
    {
        std::cout<<"v has value: " << v.get();
    }
    else
    {
        std::cout<<"v has no value!";
    }
}

int main()
{
   f(12);
   f("string");
   return 0;
}

>Solution :

Yes, that’s possible, but it doesn’t work together with template deduction (f(12) will try to instantiate a f<int&&>, which doesn’t exist). Your code will compile when you call it like that:

f(boost::optional<int>{12});

or explicitly instantiate it:

f<int>(12);