Basics: Templates – Part 2 Bob Steagall CppCon 2021CppCon 2021 – Back to Basics: Templates – Part 2 Copyright © 2021 Bob Steagall Recap: Templates • C++ supports generic programming with templates • A kinds of templates • Function templates • Class templates • Member function templates • Alias template • Variable templates • Lambda templates 2CppCon 2021 – Back to Basics: Templates – Part 2 Copyright inclusion preprocessing directives (#ifdef) • And all macros expanded 3CppCon 2021 – Back to Basics: Templates – Part 2 Copyright © 2021 Bob Steagall Recap: Declarations and Definitions • A name is an identifier

Back to Basics: Templates – Part 1 Bob Steagall CppCon 2021CppCon 2021 – Back to Basics: Templates – Part 1 Copyright © 2021 Bob Steagall Overview • Rationale • Template fundamentals • Template categories categories in detail 2CppCon 2021 – Back to Basics: Templates – Part 1 Copyright © 2021 Bob Steagall Goals and References • Goals • Cover major features • Explain some important terminology and concepts concepts • Point to next steps • Recommended references • C++ Templates The Complete Guide, Second Edition David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor – Addison-Wesley 2018 • Effective Modern

Info @Andreas__Fertig B2B: C++ Templates Part 1 fertig adjective /ˈfɛrtɪç/ finished ready complete completed Andreas Fertig v1.0 B2B: C++ Templates 2 B2B: C++ Templates ­ Part 1 © 2020 Andreas Fertig flexi­ bility. Andreas Fertig v1.0 B2B: C++ Templates 3 Templates ■ Templates are a kind of pattern for the compiler. ■ We can instantiate templates with different types or values. ■ Each instantiation ment. ■ Templates reduce a lot of writers’ work. We do not have to implement functions multiple times just because it’s a slightly different type. ■ There are different types of templates: ■ Function­templates

Fertig https://AndreasFertig.Info post@AndreasFertig.Info @Andreas__Fertig B2B: C++ Templates Part 2 Variadic templates: Parameter pack ■ Syntax: A typename|class... Ts generates a type template pa­ rameter B2B: C++ Templates 2 B2B: C++ Templates ­ Part 2 © 2020 Andreas Fertig https://AndreasFertig.Info post@AndreasFertig.Info 1Variadic templates ■ With C++11, there are variadic templates: ■ Variadic Variadic templates are templates that take any number of parameters. ■ Already known by variadic macros or variadic functions. 1 A Helper functions to convert everything into a std::string 2 auto Normalize(const

. . . . . . . . . . . . 458 7 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503 8 Templates out of the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 634 2 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . monitoring, once in the database • apply templates to monitored devices Use of templates • grouping checks in templates • templates can inherit other templates Network discovery • automatic discovery

. . . . . . . . . . . . 421 7 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458 8 Templates out of the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596 2 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . monitoring, once in the database • apply templates to monitored devices Use of templates • grouping checks in templates • templates can inherit other templates Network discovery • automatic discovery

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 URI Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 1.6. URI Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 1.6.3. URI Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . 448 8 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475 9 Templates out of the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618 2 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . monitoring, once in the database • apply templates to monitored devices Use of templates • grouping checks in templates • templates can inherit other templates Network discovery • automatic discovery

. . . . . . . . . . . . 417 8 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444 9 Templates out of the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 2 Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . monitoring, once in the database • apply templates to monitored devices Use of templates • grouping checks in templates • templates can inherit other templates Network discovery • automatic discovery

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 URI patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 1.5. URI Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 1.5.3. URI Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .