## CppCon 2020 Template Metaprogramming: Type Traits Part 1 Jody Hagins jhagins@maystreet.com coachhagins@gmail.com ## CppCon 2020 Template Metaprogramming: Type Traits Introduction ## I ntended Audience oriented: shallow depth, slow current - Not necessarily beginner to C++, but beginner to traditional template metaprogramming techniques ## I ntended Audience • Beginner/Intermediate • Gentle entry: swimming oriented: shallow depth, slow current - Not necessarily beginner to C++, but beginner to traditional template metaprogramming techniques • Type traits part of standard library for ~10 years ## I ntended Audience

## Template-Less MetaProgramming 0 ## +24 ## KRIS JUSIAK 2024 September 15 - 20 ## Template Metaprogramming (TMP) template using meta_fun = this_talk; ## static_assert(Template::Metaprogramming::is_hard); // ✓ ?static_assert(Template::Metaprogramming::is_hard); // ✓ ?static_assert(Template::Metaprogramming::is_powerful); // ✓ ?static_assert(Template::Metapr // ✓ ?static_assert(Template::Metaprogramming::is_powerful); // ✓ ?static_assert(( Template::Metaprogramming::is_easy and Template::Metaprogramming::is_powerful and Template::Metaprogramming::has

parsimonious with new features.) ## THE FEATURE Here's what we came up with: struct S { template auto func(this Self&& self); }; By the end of this talk, you will argument" explicit on non-static member functions. Practically everything else is unchanged: • template deduction rules ## WHAT CHANGED, AND WHAT DIDN'T We added this as an annotation (on the first parameter argument" explicit on non-static member functions. Practically everything else is unchanged: • template deduction rules • overload resolution ## WHAT CHANGED, AND WHAT DIDN'T We added this as an annotation

## V ariadic templates: Parameter pack ## ■ Syntax: A typename|class... Ts generates a type template parameter pack with optional name. B Args... ts a function argument parameter pack with optional D ts... in the body of a function to unpack the arguments. 1 templatetemplate="" 4="" constexpr="" auto="" 5="" min(const="" t&="" a,="" const="" std::string(t); } 5 Catch all others and apply to_string 6 template auto Normalize(const T& t) { return std::to_string(t); } 7 template auto _StrCat(std::string&

• Write views that actually do something • Raising a 404 error • Use the template system • Removing hardcoded URLs in templates • Namespacing URL names classes Working with form templates Further topics Templates - The Django template language - Support for template engines Class-based views - Introduction to class-based views - Built-in Django's cache framework - Setting up the cache - The per-site cache - The per-view cache - Template fragment caching - The low-level cache API - Asynchronous support - Downstream caches - Using

josuttis.com 3 josuttis | eckstein IT communication ## Generic Function to Insert a Value C++98 template void add(CollT& coll, const T& val) { coll.push_back(val); me> Overloading Function Templates template void add(CollT& coll, const T& val) { coll.push_back(val); } template communication Constraints with Concepts C++20 template concept HasPushBack = requires (CollT c, CollT::value_type v) { c.push_back(v); }; template requires

a1ad2e19b/p1_1.jpg) ## Agenda OpenEdge Data Service Architecture JSDO DataSource ☐ Starter Template ■ Demo ■ Next Steps ## Progress $ ^{®} $ OpenEdge $ ^{®} $  ## Starter Template ☑ Create using: • tns create --template tns-template-master-detail-progress-ng ail-progress-ng ☑ Based on the NativeScript template-master-detail-ng ■ Provides CRUD support ☑ Optional login page with the following authentication models: • Anonymous Basic Form EXPLORER

3 How the documentation is organized 2 1.4 The model layer 2 1.5 The view layer 2 1.6 The template layer 3 1.7 Forms 3 1.8 The development process 3 1.9 The admin 4 1.10 Security 4 1.11 777 4.5 How to write custom lookups 792 4.6 How to implement a custom template backend 798 4.7 How to create custom template tags and filters 802 4.8 How to write a custom storage class 823 4.9 CSV | Generating PDF • Middleware: Overview | Built-in middleware classes ### 1.6 The template layer The template layer provides a designer-friendly syntax for rendering the information to be presented

Plugins Reference 25 2 Advanced 31 2.1 Internationalization 31 2.2 Sitemap Guide 33 2.3 Template Tags 33 2.4 Command Line Interface 39 3 Extending the CMS 41 3.1 Extending the CMS: Examples you now require to have the 'sekizai.context_processors.sekizai' context processor in your TEMPLATE_CONTEXT_PROCESSORS setting. All templates in CMS_Templates must contain at least the js and css rather has to be enabled explicitly using the {%cms_toolbar %} template tag from the cms_tags template tag library in your templates. The template tag should be placed somewhere within the body of the HTML

... 83 Static Content ... 83 Custom Favicon ... 85 ConfigurableWebBindingInitializer ... 85 Template engines ... 85 Error Handling ... 85 Custom error pages ... 86 Mapping error pages outside Starter for building MVC web applications using FreeMarker views Pom spring-boot-starter-groovy-template Starter for building MVC web applications using Groovy Templates views Pom spring-boot-starter-eoas Spring Boot use caches to improve performance. For example, template engines will cache compiled templates to avoid repeatedly parsing template files. Also, Spring MVC can add HTTP caching headers to responses