Template Metaprogramming: Type Traits Part 1 CppCon 2020 1 Jody Hagins
 jhagins@maystreet.com 
 coachhagins@gmail.comTemplate Metaprogramming: Type Traits CppCon 2020 2 IntroductionIntended Audience oriented: shallow depth, slow current • Not necessarily beginner to C++, but beginner to traditional template metaprogramming techniques 3Intended 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 3Intended Audience

1 / 58Template Metaprogramming (TMP) Template Metaprogramming (TMP) template using meta_fun = this_talk; 2 / 58❓static_assert(Template::Metaprogramming::is_hard); // ✔ 3 / 58❓s 58❓static_assert(Template::Metaprogramming::is_hard); // ✔ ❓static_assert(Template::Metaprogramming::is_powerful); // ✔ 3 / 58❓static_assert(Template::Metaprogramming::is_hard); // ✔ ❓static_assert( ❓static_assert(Template::Metaprogramming::is_powerful); // ✔ ❓static_assert(( Template::Metaprogramming::is_easy and Template::Metaprogramming::is_powerful and Template::Metaprogramming::has_nice_error_messages

Selections Removing Selections Display Modes Global Selection Mask (Painting a Selection) Selection from layer transparency Pixel and Vector Selection Types Common Shortcuts while Using Selections Python Scripting Workflow Introduction to animation: How to make a walk cycle Japanese Animation Template Basic structure of its layers Its layer contents Basic steps to make animation Gamut Masks Selecting a gamut mask Transparency Blending modes Masks Filters Filter Brush Engine Filter Layers, Filter Masks and Layer Styles Transformations Deform Brush Engine Transform Masks Animation Assistants, Grids and Guides

Notes Advanced Configuration Network Policy Policy Enforcement Modes Rule Basics Layer 3 Examples Layer 4 Examples Layer 7 Examples Kubernetes Endpoint Lifecycle Troubleshooting Monitoring & Metrics Installation Management Release Cadence Stable releases LTS Generic Release Process GitHub template process Reference steps for the template Minor Release Process Backporting process CI / Jenkins Jobs Overview Triggering identity (in contrast to IP address identification in traditional systems) and can filter on application-layer (e.g. HTTP). As a result, Cilium not only makes it simple to apply security policies in a highly dynamic

. . . . . . . . . . . . . 100 8.1.1 Layer Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 8.2 Layer Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321 14.5.6 Open as Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324 14.5.10 Save as Template . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324

first view Writing more views Write views that actually do something Raising a 404 error Use the template system Removing hardcoded URLs in templates Namespacing URL names Writing your first Django app Django Form classes Working with form templates Further topics Templates Support for template engines The Django template language Class-based views Introduction to class-based views Built-in class-based Installation Usage Django’s cache framework Setting up the cache The per-site cache The per-view cache Template fragment caching The low-level cache API Downstream caches Using Vary headers Controlling cache:

. . . . . . . . . . . . 1 1.3 The model layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.4 The view layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.5 The template layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.6 Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529 4.5 Custom template tags and filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 534

Overview Writing more views Write views that actually do something Raising a 404 error Use the template system Removing hardcoded URLs in templates Namespacing URL names Writing your first Django app Django Form classes Working with form templates Further topics Templates Support for template engines The Django template language Class-based views Introduction to class-based views Built-in class-based Installation Usage Django’s cache framework Setting up the cache The per-site cache The per-view cache Template fragment caching The low-level cache API Downstream caches Using Vary headers Controlling cache:

. . . . . . . . . . . . 2 1.4 The model layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.5 The view layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.6 The template layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.7 Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555 4.5 Custom template tags and filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559

Overview Writing more views Write views that actually do something Raising a 404 error Use the template system Removing hardcoded URLs in templates Namespacing URL names Writing your first Django app Django Form classes Working with form templates Further topics Templates Support for template engines The Django template language Class-based views Introduction to class-based views Built-in class-based Installation Usage Django’s cache framework Setting up the cache The per-site cache The per-view cache Template fragment caching The low-level cache API Downstream caches Using Vary headers Controlling cache: