I/O Objects T H E N E T W O R K I N G T S F R O M S C R A T C H Robert Leahy - rleahy@rleahy.caNetworking TS & Asio ISO C++ Networking is blocked on Executors (P0443) Target for Networking is composed asynchronous operations depend on those guarantees being honored transitively 6I/O Objects “I/O objects” provide a handle to low level asynchronous functionality within the framework of the Networking one or more I/O objects) is a useful pattern 19Service Named Type Requirement Service objects own completion handlers thereby breaking the potential ownership cycle Service objects are owned by an

std::string Bar std::stringObject Introspection (OI) Goals • Byte level memory footprint analysis for objects • Complete object type hierarchies • Dynamic allocations and containers • Optimised, production (Cumulative) Feature folly::small_vector 414132 8 2.359 10 0 88 25315061 • 2800 nested objects of type ‘FooBar’ were analysed. Top of the list: • UnusedSz (cumulative) = (10 - 2.359) * 8 * 4141321 Example 2 • 1000 objects of type ‘FooBar’ were sampled and introspectedApplied Example 2 • 1000 objects of type ‘FooBar’ were sampled and introspectedApplied Example 2 • 1000 objects of type ‘FooBar’

background-image Writing your first Django app, part 7 Customize the admin form Adding related objects Customize the admin change list Customize the admin look and feel Customize the admin index page logging configuration Pagination Example Using Paginator in a view Paginator objects InvalidPage exceptions Page objects Security in Django Cross site scripting (XSS) protection Cross site request forgery performance Template performance Using different versions of available software Serializing Django objects Serializing data Deserializing data Serialization formats Natural keys Django settings The basics

background-image Writing your first Django app, part 7 Customize the admin form Adding related objects Customize the admin change list Customize the admin look and feel Customize the admin index page performance Template performance Using different versions of available software Serializing Django objects Serializing data Deserializing data Serialization formats Natural keys Django settings The basics Accepting optional arguments Management commands and locales Testing Overriding commands Command objects How to create custom model fields Introduction Background theory Writing a field subclass Writing

background-image Writing your first Django app, part 7 Customize the admin form Adding related objects Customize the admin change list Customize the admin look and feel Customize the admin index page performance Template performance Using different versions of available software Serializing Django objects Serializing data Deserializing data Serialization formats Natural keys Django settings The basics Accepting optional arguments Management commands and locales Testing Overriding commands Command objects How to create custom model fields Introduction Background theory Writing a field subclass Writing

background-image Writing your first Django app, part 7 Customize the admin form Adding related objects Customize the admin change list Customize the admin look and feel Customize the admin index page logging configuration Pagination Example Using Paginator in a view Paginator objects InvalidPage exceptions Page objects Security in Django Cross site scripting (XSS) protection Cross site request forgery performance Template performance Using different versions of available software Serializing Django objects Serializing data Deserializing data Serialization formats Natural keys Django settings The basics

background-image Writing your first Django app, part 7 Customize the admin form Adding related objects Customize the admin change list Customize the admin look and feel Customize the admin index page performance Template performance Using different versions of available software Serializing Django objects Serializing data Deserializing data Serialization formats Natural keys Django settings The basics Accepting optional arguments Management commands and locales Testing Overriding commands Command objects How to create custom model fields Introduction Background theory Writing a field subclass Writing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512 3.20 Serializing Django objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518 3.21 Django . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1101 6.16 Request and response objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1249 6.17 SchemaEditor QuerySet method reference | Lookup expressions • Model instances: Instance methods | Accessing related objects • Migrations: Introduction to Migrations | Operations reference | SchemaEditor | Writing migrations

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558 3.20 Serializing Django objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 564 3.21 Django . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1437 6.18 Request and response objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1440 6.19 SchemaEditor QuerySet method reference | Lookup expressions • Model instances: Instance methods | Accessing related objects • Migrations: Introduction to Migrations | Operations reference | SchemaEditor | Writing migrations

background-image Writing your first Django app, part 7 Customize the admin form Adding related objects Customize the admin change list Customize the admin look and feel Customize the admin index page performance Template performance Using different versions of available software Serializing Django objects Serializing data Deserializing data Serialization formats Natural keys Django settings The basics Accepting optional arguments Management commands and locales Testing Overriding commands Command objects Writing custom model fields Introduction Background theory Writing a field subclass Writing a FileField