Using the Microsoft Graph API to get Office 365 data in your mobile apps Alex Ziskind Technical Director @digitalix www.nuvious.com Hi, I’m Alex From + 750 Million 50 Million per month Problems

Atomics and concurrency patterns • How existing atomic are implemented (the split reference count technique) • Deferred reclamation, i.e., garbage collection in C++ Some assumed knowledge Atomics and concurrency patterns • How existing atomic are implemented (the split reference count technique) • Deferred reclamation, i.e., garbage collection in C++ Some assumed knowledge control_block pointer as a lock26 Daniel Anderson -- danielanderson.net Solution #2: The split reference count • Used by Folly (Facebook open-source library, used in production), • Used by JustThreads

2nd, 3rd, 4th, and 5th Edition  Co-author of C++ Standard Library Quick Reference& C++17 Standard Library Quick Reference  Founder of the Belgian C++ Users Group (BeCPP) C++204 Agenda  C++23 a value, false otherwise  value(): returns reference to the contained value, or throws bad_expected_access if no value  error(): returns reference to the error91 Agenda  C++23 Core Language fails: std::cout << Process([p = std::make_unique(42)] { return *p; });  “Attempting to reference a deleted function”  The copy ctor of the std::function tries to copy the lambda, which is not

elementsResources • ArcGIS Runtime API for Qt - https://developers.arcgis.com/qt/ • ArcGIS Runtime Toolkit for Qt API reference - https://developers.arcgis.com/qt/toolkit/api-reference/ • ArcGIS Runtime Toolkit

“width”. Explicitly state/document/reference function conventions. • Defining a macro for calling conventions is a great start. For example, MYLIB_CCONV. • Reference: llvm - CallingConv.h • Don’t throw memory management”. - Reference counted - C++ – std::shared_ptr - Python - Objective-C (manual or automatic – see ARC) - Swift - COM – AddRef()/Release() - Non-Reference counted - .NET - JVM have been deleted here, if allocator was known.Memory model – Reference Counted Memory lifetime is tracked explicitly through reference counting. This typically means allocation locations are static

*/ } Because of the nested scopes, it’s safe to pass locals by reference to callees... … no dynamic allocation or reference counting needed.64 SENDER/RECEIVER IS ALSO STRUCTURED CONCURRENCY Profit!84 Step 1: Model key click as a sender85 MODEL KEYCLICK AS SENDER: STRATEGY 1. Assume system API for registering keyboard callback 2. Write a keyboard sender and op state such that: • ...the function stores the returned object in the operation state91 “SYSTEM” API FOR REGISTERING KEYBOARD CALLBACK // Fake system API for registering keyboard input callback: void register_keyboard_callback(void

(or classes) of vertices and edges Labels 查询语言：基于 Cypher 贴合 ISO GQL Standard • Incorporate by reference specifications from SQL/Framework and SQL/Foundation • Capabilities needed by both SQL/PGQ (Property Cypher AST Unresolved Logical Plan Logical Plan Optimized Logical Plan Physical Plan Program API Analysis rules Optimization rules: MATCH -> pushdown Planning Strategies Graph Execution Code

constexpr 函数，可以放心大胆在模板尖括号内使用。 模板的难题：移到另一个文件中定义 • 如果我们试着像传统函数那样分离模板函数的声明与实现： • 就会出现 undefined reference 错误： 模板的难题：移到另一个文件中定义（续） • 这是因为编译器对模板的编译是惰性的，即只有当前 .cpp 文件用到了这个模板，该模板 里的函数才会被定义。而我们的 sumto.cpp 或者 int(*)(int) 即可。 • 函数指针效率更高一些，但是 [] 就没办法 捕获局部变量了（全局变量还是可以的） 。 • 最大的好处是可以伺候一些只接受函数指 针的 C 语言的 API 比如 pthread 和 atexit 。 lambda + 模板：双倍快乐 • 可以将 lambda 表达式的参数声明为 auto ，声明为 auto 的参数会自动根据调 用者给的参数推导类型，基本上和

Edition (C++20) coming later this year  Co-author of C++ Standard Library Quick Reference& C++17 Standard Library Quick Reference  Founder of the Belgian C++ Users Group (BeCPP)3 C++20 C++20 is big! Lots C++11: remove "atomic_" and use special // functions every time you touch head public: class reference { shared_ptr p; }; auto find(T t) const { auto p = head.load(); atomic_load(&head) while (p && p->t != t) p = p->next; return reference(move(p)); } auto front() const { return reference(head); } void push_front(T t) { auto p = make_shared();

2nd, 3rd, 4th, and 5th Edition  Co-author of C++ Standard Library Quick Reference& C++17 Standard Library Quick Reference  Founder of the Belgian C++ Users Group (BeCPP) C++203 Agenda  Compile-Time