Template and Function Parameter Packs
As a starting point to see how parameter packs work, let’s consider a simple template function, one that displays a list consisting of just one item:
template<typename T>void show_list0(T value){ std::cout << value << ", ";}
This definition has two parameter lists. The template parameter list is just T
. The function parameter list is just value
. A function call such as the following sets T
in the template parameter list to double
and value
in the function parameter list to 2.15
:
show_list0(2.15);
C++11 provides an ellipsis meta-operator that enables you to declare an identifier for a template parameter pack, essentially a list of types. Similarly, it lets you declare an identifier for a function parameter ...
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