## 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

### Named Optional Parameters - JavaScript Style Brian Davidson (briandavidson@meta.com) ## Summary C++ developers often run into the situation where we have multiple parameters in a function with the function arguments forming a clear function call ## I nspiration: Javascript The anonymous object parameters of javascript provide a readable function API. logger({one:0.9999}); > 0.9999 logger({one:"one"

## 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

## 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="" C++11, there are variadic templates: Variadic templates are templates that take any number of parameters. - Already known by variadic macros or variadic functions. 1 Helper functions to convert everything

instantiation for a new type or value results in additional code, the fill-in template is generated with the given template argument. Templates reduce a lot of writers' work. We do not have to implement Templates are always initiated by the keyword template. ## The different kinds of template parameters There are three different types of template parameters: Type parameter whenever we use a concrete type type, e.g., int, char, or even a class. Type parameters are the most common type. none-type parameter typically values like 3. Excluded are floating-point numbers and strings (C-arrays). Since C++20,

• 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

the SQL code. See SQL Editor for information about SQL-specific commands. NOTE: SQL Assist, SQL Template, and SQL Context Information menu items on the context menu are disabled if the SQL script is read-only clipboard| |Advanced Copy|Opens advanced copy submenu that allows copying data with preset formatting parameters| |Paste|Pastes the copied content to the cells in focus| |Advanced Paste|Pastes several values expressions or SQL expression templates via the context menu. To select a ready SQL expression or a template, press F11 or right-click the cell, then click Order/Filter on the context menu and then click one

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

the SQL code. See SQL Editor for information about SQL-specific commands. NOTE: SQL Assist, SQL Template, and SQL Context Information menu items on the context menu are disabled if the SQL script is read-only clipboard| |Advanced Copy|Opens advanced copy submenu that allows copying data with preset formatting parameters| |Paste|Pastes the copied content to the cells in focus| |Advanced Paste|Pastes several values expressions or SQL expression templates via the context menu. To select a ready SQL expression or a template, press F11 or right-click the cell, then click Order/Filter on the context menu and then click one