The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
#include "rparam.hpp"
#include "rparamcls.hpp"
// function that allows parameter passing by value or by reference
template<typename T1, typename T2>
void foo_core (typename RParam<T1>::Type p1,
typename RParam<T2>::Type p2)
{
//...
}
// wrapper to avoid explicit template parameter passing
template<typename T1, typename T2>
void foo (T1 && p1, T2 && p2)
{
foo_core<T1,T2>(std::forward<T1>(p1),std::forward<T2>(p2));
}
int main()
{
MyClass1 mc1;
MyClass2 mc2;
foo(mc1,mc2); // same as foo_core<MyClass1,MyClass2>(mc1,mc2)
}