[Boost-users] function template with a universal reference to a specific type

Subject: [Boost-users] function template with a universal reference to a specific type
From: Ireneusz Szcześniak (irek.szczesniak_at_[hidden])
Date: 2018-12-30 15:04:27

Hi,

I'm writing to ask a C++ question, not specifically Boost-related, but 
this list is the best place I know.

How can I write a function template, which has a parameter of the 
universal reference to a specific type?

I can write a function template like this:

template <typename T>
void
foo(T &&t)
{
   // The primary template implementation.
   cout << "Primary: " << __PRETTY_FUNCTION__ << endl;
}

And so I can call this function with an expression of any value 
category, and any type, cv-qualified or not, like this:

int
main()
{
   foo(1);
   int i = 1;
   foo(i);
   const int ci = 1;
   foo(ci);
}

In my code I need to provide different implementations of foo for 
different types (and these types are templated).  How can I accomplish 
that?

Best,
Irek