C++17: Deduction Guides

C++17 can sometimes deduce class template parameters. To do this, C++17 uses Deduction Guides. There are two kinds of Deduction Guides: 1) Automatic Deduction Guides; and 2) User-Defined Deduction Guides.

References:

https://stackoverflow.com/questions/40951697/what-are-template-deduction-guides-in-c17

http://en.cppreference.com/w/cpp/language/class_template_argument_deduction