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

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

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

Server 90. Hot Swapping Reload Static Content Reload Templates without Restarting the Container Thymeleaf Templates FreeMarker Templates Groovy Templates Fast Application Restarts Reload Java Classes without applications using FreeMarker views Pom spring-boot-starter- groovy-templates Starter for building MVC web applications using Groovy Templates views Pom spring-boot-starter- hateoas Starter for building by Spring Boot use caches to improve performance. For example, template engines cache compiled templates to avoid repeatedly parsing template files. Also, Spring MVC can add HTTP caching headers to responses

Server 90. Hot Swapping Reload Static Content Reload Templates without Restarting the Container Thymeleaf Templates FreeMarker Templates Groovy Templates Fast Application Restarts Reload Java Classes without applications using FreeMarker views Pom spring-boot-starter- groovy-templates Starter for building MVC web applications using Groovy Templates views Pom spring-boot-starter- hateoas Starter for building by Spring Boot use caches to improve performance. For example, template engines cache compiled templates to avoid repeatedly parsing template files. Also, Spring MVC can add HTTP caching headers to responses

Server 91. Hot Swapping Reload Static Content Reload Templates without Restarting the Container Thymeleaf Templates FreeMarker Templates Groovy Templates Fast Application Restarts Reload Java Classes without applications using FreeMarker views Pom spring-boot-starter- groovy-templates Starter for building MVC web applications using Groovy Templates views Pom spring-boot-starter- hateoas Starter for building by Spring Boot use caches to improve performance. For example, template engines cache compiled templates to avoid repeatedly parsing template files. Also, Spring MVC can add HTTP caching headers to responses

90. Hot Swapping Reload Static Content Reload Templates without Restarting the Container Thymeleaf Templates FreeMarker Templates Groovy Templates Fast Application Restarts Reload Java Classes without applications using FreeMarker views Pom spring-boot-starter- groovy-templates Starter for building MVC web applications using Groovy Templates views Pom spring-boot-starter- hateoas Starter for building by Spring Boot use caches to improve performance. For example, template engines cache compiled templates to avoid repeatedly parsing template files. Also, Spring MVC can add HTTP caching headers to responses