Function Templates

Function Templates #

A function template is defined by the keyword template followed by type or non-type parameters in front of a concrete function. After that, replace the concrete types or non-types with the type or non-type parameters in the function.

• The keywords class or typename declare the parameters.
• The name T is usually used for the first parameter.
• The parameters can be used in the body of the function.

Passing Arguments in Function Templates #

In the given code snippet, we’ll look at how we can call the initialized variables with our template. Looking at line 2, the function arguments x and y in the function xchg must have the same type. By providing two type parameters like in line 5, the types of arguments can be different. In line 9, we see a non-type template parameter N.