Detroit has the largest municipal bankruptcy in US history. The city is an estimated $20 billion in debt. Michigan Fact #4 • 74% of the US’s tart cherries come from Michigan. Michigan Fact #5 • Mackinac

std::to_underlying()  Associative Containers Heterogeneous Erasure  Removed Features  Garbage Collection SupportC++23 Core Language6 Agenda  C++23 Core Language  Explicit Object Parameters  if std::to_underlying()  Associative Containers Heterogeneous Erasure  Removed Features  Garbage Collection Support7 Explicit Object Parameters  Instead of implicit this, explicitly specify the object std::to_underlying()  Associative Containers Heterogeneous Erasure  Removed Features  Garbage Collection Support13 if consteval  Syntax: if consteval { /* A */ } else { /* B */ }  No condition

CallingConv.h • Don’t throw exceptions across the boundary.Memory model https://gchandbook.org/ Garbage collection is really “automatic memory management”. - Reference counted - C++ – std::shared_ptr - Python Sys_Query( ); Handle.Free( ); // Collection occurs. // Copy, compacting, etc. // obj now at 0x6800. // 0x9200 -> 0x6800 Sys_Query(hnd); hnd // Collection occurs. // obj now at 0x7200. // 0x9200 0x9200 –> 0x???? Sys_Query(hnd); // Collection occurs. // obj now “free”. // 0x9200 -> 0x7200 Sys_Done(hnd); hnd This is only one possible sequence.Memory model – Non-Reference Counted Common ways

• Compiled to native code offering performance similar to C • Memory management without garbage collection • Designed for systems programming Rust is a multi-paradigm programming language focused on performance generated using bindgen. • vm-memory: abstractions over a virtual machine's memory. • vmm-sys-util: collection of modules providing helpers and utilities for building VMMs and hypervisors. Release Crates

atomic are implemented (the split reference count technique) • Deferred reclamation, i.e., garbage collection in C++ Some assumed knowledge • You’ve heard of lock-free programming and know what a compare_exchange atomic are implemented (the split reference count technique) • Deferred reclamation, i.e., garbage collection in C++ Some assumed knowledge • You’ve heard of lock-free programming and know what a compare_exchange

C = Incrementable && Decrementable; void Foo(C auto t);  The Standard defines a whole collection of standard concepts:  same, derived_from, convertible_to, integral, constructible, … 