## 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

22 4.2 Options of the schematic editor ..... 23 4.2.1 General options ..... 23 4.2.2 Template fields names ..... 23 4.3 Search tool ..... 24 4.4 Netlist tool ..... 25 4.5 Annotation tool Modification (already placed component) ..... 34 5.4.3.1 Component modification ..... 34 5.4.3.2 Text fields modification ..... 35 5.5 Wires, Buses, Labels, Power ports ..... 35 5.5.1 Introduction .... Pins for Multiple Units and Alternate Symbolic Representations 97 1.9 Component Fields 98 1.9.1 Editing Component Fields 98 1.10 Power Symbols 99 12 LibEdit - Complements 101 12.1 Overview 101 12

Error Messages • Output Fields • Basic Usage • Renaming Attributes • Default Values • Custom Fields & Multiple Values • Url & Other Concrete Fields • Complex Structures Field • Advanced : Nested Field • Extending Flask-RESTful • Content Negotiation • Custom Fields & Inputs ○ Response Formats ☐ Resource Method Decorators Custom Error Handlers • Intermediate function, class or method, this part of the documentation is for you. • API Docs ○ Api o ReqParse Fields o Inputs ## Additional Notes See Flask’s license [http://flask.pocoo.org/docs/license/] for legal

## 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&

1 User's Guide 3 1.1 Installation 3 1.2 Quickstart 3 1.3 Request Parsing 9 1.4 Output Fields 13 1.5 Extending Flask-RESTful 17 1.6 Intermediate Usage 22 2 API Reference 27 2.1 API Docs does not define. args = parser.parse_args(strict=True) #### 1.2.5 Data Formatting By default, all fields in your return iterable will be rendered as-is. While this works great when you're just dealing the fields module and the `marshall_with()` decorator. Similar to the Django ORM and WTForm, you use the fields module to describe the structure of your response. from flask_restful import fields, marshal_with

Error Handling Error Messages Output Fields Basic Usage Renaming Attributes Default Values Custom Fields & Multiple Values Url & Other Concrete Fields Complex Structures List Field Advanced Advanced : Nested Field Extending Flask-RESTful Content Negotiation ○ Custom Fields & Inputs ○ Response Formats ☐ Resource Method Decorators Custom Error Handlers • Intermediate Usage Project Structure function, class or method, this part of the documentation is for you. • API Docs ○ Api o ReqParse Fields o Inputs ## Additional Notes See Flask’s license [http://flask.pocoo.org/docs/license/] for legal

• 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 migrations to apps - Reversing migrations - Historical models - Considerations when removing model fields - Data Migrations - Squashing migrations - Serializing values - Supporting multiple Django

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

1 User's Guide 3 1.1 Installation 3 1.2 Quickstart 3 1.3 Request Parsing 9 1.4 Output Fields 13 1.5 Extending Flask-RESTful 17 1.6 Intermediate Usage 22 2 API Reference 27 2.1 API Docs does not define. args = parser.parse_args(strict=True) #### 1.2.5 Data Formatting By default, all fields in your return iterable will be rendered as-is. While this works great when you're just dealing the fields module and the `marshall_with()` decorator. Similar to the Django ORM and WTForm, you use the fields module to describe the structure of your response. from flask_restful import fields, marshal_with