struct default_init { constexpr auto operator()() const { if constexpr (std::is_default_constructible_v) { return T{}; } } }; template Init = default_init()> struct struct member { constexpr member() : value(Init()) {} };Default Initialization With Constant using Person = meta_struct< // member<"id", int>, default initialization to depend on another member u We use a lambda that takes a self parameterDefault Init with Expression int main() { using Person = meta_struct<

{NULL, NULL, 0, NULL} }; static struct PyModuleDef hello_world_python = { PyModuleDef_HEAD_INIT, "hello_world_python", "Simple python module", -1, HWMethods }; PyMODINIT_FUNC PyInit_hello_world_python(void) } };Classes! BOOST_PYTHON_MODULE(binary_reader_bpy) { class_("Row", no_init) .def("nanotime", &Row::nanotime) .def("items", &Row::items, return_internal_reference<>()); w>") .def(vector_indexing_suite>()); class_("RowReader", init(arg("filename"))) .def("getRows", &RowReader::getRows) .def("getIdName"

TwoStepInitThing { public: TwoStepInitThing(); void Init(); void Use(); // hmm... // ... }; int main() { // correct usage TwoStepInitThing tsit; tsit.Init(); // Ok, now tsit is ready to be used tsit.Use(); you deserve 153The beauty of friend class TwoStepInitThing { public: TwoStepInitThing(); void Init(); void Use(); // hmm... // ... }; int main() { TwoStepInitThing tsit; tsit.Use(); // oops! Not the ancients », you want to provide a factory for that type • The goal is to ensure that a call to Init always follows construction, and the object is only made available once both steps have been performed

SPMD Program #include #include int main(int argc, char** argv) { BCL::init(); fmt::print(“Hello from rank {}\n”, BCL::rank()); BCL::finalize(); return SPMD Program #include #include int main(int argc, char** argv) { BCL::init(); fmt::print(“Hello from rank {}\n”, BCL::rank()); BCL::finalize(); return SPMD Program #include #include int main(int argc, char** argv) { BCL::init(); fmt::print(“Hello from rank {}\n”, BCL::rank()); BCL::finalize(); return

namespace dr::shp; using namespace oneapi; template T reduce(R&& r, T init) { /*...*/ }Distributed Algorithms - Algorithms accept distributed range parameters - Access namespace dr::shp; using namespace oneapi; template T reduce(R&& r, T init) { std::vector futures; for (auto&& segment : segments(r)) { if (size(segment) segment); futures.push_back(f); } } for (auto&& f : futures) { init += f.get(); } return init; }Distributed Algorithms - Algorithms accept distributed range parameters - Access

return result cls.copy = _wrapped_copy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 class MyClass: def __init__(self, x): self.x = x def copy(self): return MyClass(self.x) >>> modify_cls(MyClass) bindings - what we don't want BOOST_PYTHON_MODULE(binary_reader_bpy) { class_("Item", no_init) .def_readonly("id", &Item::id) .def("value", &Item::getPyValue); class_()); class_( "RowReader", init(arg("filenam ) .def("getRows", &RowReader::getRows) .def("getIdName"

SLIDES } } extern "C" { // This is the main loop in the SSC stack. void MainLoop(void); } int main() { init(); while (1U) { // The SSC main loop handles the EtherCAT state machine MainLoop(); /** UGLY CODE get_cyclic_status(); fill_pdo_status(status, pdo_out); } } extern "C" { void MainLoop(void); } int main() { app.init(); while (1U) { MainLoop(); app.app_loop(); } } main things slushie_app get_cyclic_status(); fill_pdo_status(status, pdo_out); } } extern "C" { void MainLoop(void); } int main() { app.init(); while (1U) { MainLoop(); app.app_loop(); } } main things slushie_app

com | 49 struct NetworkConnection { virtual void initializeConfig() = 0; // Pure Virtual void init() { initializeConfig(); // ... }; }; struct Tcp : public NetworkConnection { void (CRTP)atomosspace.com | 51 template class NetworkConnection { public: void init() { (static_cast(this))->initializeConfig(); // ... }; }; class Tcp Object Parameter/Deducing Thisatomosspace.com | 53 struct NetworkConnection { public: void init(this auto&& self) { self.initializeConfig(); // ... }; }; class Tcp : public

region { int size; }; void init_region(char* backing_buffer, size_t buffer_size ) { if(buffer_size < current_region.size) { LOG(“Buffer size too small”); return; } //other init code }An Introduction struct region { int size; }; void init_region(char* backing_buffer, size_t buffer_size ) { if(buffer_size < current_region.size) { LOG(“Buffer size too small”); return; } //other init code }An Introduction struct int size; }; void init_region(char* backing_buffer, size_t buffer_size ) { if(buffer_size < (size_t)current_region.size) { LOG(“Buffer size too small”); return; } //other init code }An Introduction

NULL; if(!instance_) instance_ = new Singleton(); return instance_; } void func(...); static void init(...); private: Singleton(); Singleton(const Singleton&); void operator=(const Singleton&); }; main(int argc, char* argv[]) { ... Comm::init(); Cache::init(); Db::init(); ... }int main(int argc, char* argv[]) { ... Comm::init(); // oops Cache::init(); Db::init(); ... } Bloomberg 44 Comm Cache Db Initialization Dependencies int main(int argc, char* argv[]) { ... Db::init(); // Correct Cache::init(); Comm::init(); ... }Bloomberg 45 class CacheWrapper { public: CacheWrapper(DataBaseWrapper&