with a function. upon_[error|done](sender, fn) → sender … transforms the error and done signals with a function. let_[value|…](sender, fn) → sender … passes the result of input sender to function, which std::move(work) ).value(); }50 SENDER/RECEIVER AND COROUTINES By returning a sender, an async function puts the choice of whether to use coroutines or not in the hands of the caller.51 COMING UP treated like a black box. goto is an unstructured control flow construct conditional loop function call goto59 FIRE-AND-FORGET TASK MODELS ARE UNSTRUCTURED Fire-and-forget work is like goto.

Tristan Brindle Thursday, September 17 • 12:00coroutines15 Coroutines  What’s a coroutine?  A function,  with one of the following:  co_await: suspends coroutine while waiting for another computation typename V::value_type; T x { }; T::static_function(); // ... };  With C++20: [](const vector& vec) { T x { }; T::static_function(); // ... };29 Templated Lambda Expressions  Supports cooperative cancellation  Destructor automatically  Asks thread to cancel  Calls join()38 Joining & Cancellable Threads  Cancelling threads  std::stop_token  Supports actively

specifier declares a function as being a kernel. Such a function is: • Executed on the device, • Callable from the host. The __device__ execution space specifier declares a function that is: • Executed nvidia.com/cuda/cuda-c-programming-guide/ index.html#function-declaration-specifiers 36 |The __host__ execution space specifier declares a function that is: • Executed on the host, • Callable from the declare a function with only the __host__ execution space specifier or to declare it without any of the __host__, __device__, or __global__ execution space specifier; in either case the function is compiled

service mesh ● Reviews-v1 ○ doesn’t call the ratings service. ● Reviews-v2 ○ calls ratings, black stars ● Reviews-v3 ○ calls ratings, red stars Initializing services 1) Deploy bookinfo services with

links. A is automatically retired. • User removes all objects with dependence on resource X. • User calls hazard_pointer_clean_up. • A is reclaimed. B is automatically retired (as a result of calling ha

Library  Changes to Ranges Library  Changes to Views Library  std::expected  std::move_only_function<>  std::spanstream  std::byteswap()  std::to_underlying()  Associative Containers Heterogeneous Library  Changes to Ranges Library  Changes to Views Library  std::expected  std::move_only_function<>  std::spanstream  std::byteswap()  std::to_underlying()  Associative Containers Heterogeneous Library  Changes to Ranges Library  Changes to Views Library  std::expected  std::move_only_function<>  std::spanstream  std::byteswap()  std::to_underlying()  Associative Containers Heterogeneous

wapc::register_function("ping", ping); } fn ping(msg: &[u8]) -> wapc::CallResult { …. Ok(msg.to_vec()) } waPC Guest Rust waPC • Use wapc_init to register function • Register_function can only be be used inside WAPC_init • Register_function cannot be called inside ping • _start is meant to support tinygo’s wasm • waPC host will still run both "wapc_init" and "_start" during intialization intialization waPC Guest Rust waPC • Use wapc_init to register function • _start also can • Util Lib uses wapc_init, users build on top of ”_start” extern crate wapc_guest as guest; extern crate Regex;

Run down of some approaches Just be like C? – post-1972 Common Object Model (COM) – 1993 Foreign function interface (libffi) – 1996 Simplified Wrapper and Interface Generator (SWIG) – 1996 JVM – Java Native dev- >get_data_from(); return d.a + d.b; The get_data_from() function returns the struct in registers, but the get_data_from() member function returns in caller provided memory. This is often unexpected int b; }; /* Get data from device ‘dev’. */ data_t get_data_from(size_t dev); How does this function fail? C++ exceptions have no universal binary contract. Meaning the consumer may not be prepared

layouts with one GridLayout. Loops • Beware of function and memory allocations inside of loops. You see this as a standard pattern. function loopFunction () { var val = 0; for (var i=0;i<100000;i++) i=0;i<100000;i++) { doSomething( () => { val++; } ); } } Loops • Proper way function loops() { var val = 0, fun = function() { val++; }; for (var i=0;i<100000;i++) { doSomething(fun);

为了灵活性，可以用 std::function 容器。 • 只需在后面尖括号里写函数的返回类型和 参数列表即可，比如： • std::function; 如何避免用模板参数 2 ：无捕获的 lambda 可以传为函数指针 • 另外，如果你的 lambda 没有捕获任何局 部变量，也就是 [] ，那么不需要用 std::function 作为参数：用 template 然后 Func const & 做类型。 2. lambda 作为返回值：用 auto 做类型。 3. 牺牲性能但存储方便： std::function 容器。 4. lambda 作为参数：通常用 [&] 存储引用。 5. lambda 作为返回值：总是用 [=] 存储值。 • 其实 lambda 还有更多语法，比如 mutable ，