C++17 Quick Syntax Reference: A Pocket Guide to the Language, APIs and Library

© Mikael Olsson 2018

Mikael OlssonC++17 Quick Syntax Referencehttps://doi.org/10.1007/978-1-4842-3600-0_28

28. Templates

Mikael Olsson¹ 

(1)

Hammarland, Finland

 

Templates provide a way to make a class, function, or variable operate with different data types without having to rewrite the code for each type.

Function Templates

This example shows a function that swaps two integer arguments.

void swap(int& a, int& b)

{

  int tmp = a;

  a = b;

  b = tmp;

}

To convert this method into a function template that can work with any type, the first step is to add a template parameter declaration before the function. This declaration includes the template keyword followed by the keyword class and the name of the template parameter, both enclosed between angle brackets. ...