Class Layout Copyright © 2020 by Stephen C. Dewhurst and Daniel Saks 1 Class Layout Steve Dewhurst Semantics Consulting, Inc. www.stevedewhurst.com 1 Copyright © 2020 by Stephen C. Dewhurst and Daniel Daniel Saks C++ Classes  Only non-static data declarations in a class definition add anything to the size of class objects. class HR { public: ~~~ void terminator(Salary *, Hourly *, Temp *); private: Stephen C. Dewhurst and Daniel Saks 1 7Class Layout Copyright © 2020 by Stephen C. Dewhurst and Daniel Saks 2 sizeof(Class Object)  sizeof applied to the HR class yields the same result as sizeof applied

(int i : iota(2) | filter(even) | transform(square)) std::cout << i << ' '; 1 2 3 456template <class T> concept GravitationalBody = requires(T const t) { { t.GetMass() } -> std::floating_point; GetLocation() } -> std::same_as; { t.GetVelocity() } -> std::same_as; }; template <class T> concept GravitationalRange = GravitationalBody>; 1 2 3 4 5 6 7 8 construction. ranges::enable_view is true. template <class T> concept range = requires(T& t) { ranges::begin(t); ranges::end(t); }; template <class T> concept view = ranges::range &&

about? // the easy case import std; // or #include , , , class Character { std::string name_; int life_; public: constexpr Character(std::string_view suffer (among other things)What this is about? // the easy case // ... class Character { /* ... */ }; class Orc; class Hero : Character { int strength_; public: constexpr Hero(std::string_view hit an OrcWhat this is about? // the easy case // ... class Character { /* ... */ }; class Orc; class Hero : Character { /* ... */ }; class Orc : Character { int strength_; public: constexpr

it is a recipe for making things • C++ provides six kinds of templates • Function templates • Class templates • Member function templates • Alias template • Variable templates • Lambda templates definitions are permitted" • Exactly one definition of a class must appear in any translation unit that uses it in such a way that the class must be complete • The rules for inline variables and functions parameters to create a template specialization 6 template<class T1, class T2> struct pair { T1 first; T2 second; ... }; template<class T> T const& max(T const& a, T const& b) { ... } pair

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heard… • This talk is about some of the things C++ does right 15 Me, promoting my CppCon 2020 class: https://twitter.com/PatriceRoy1/status/1296153449235652609?s=20You might have heard… • This talk elegance • Situation: we have a game with all sorts of monsters • We made a class hierarchy managed within objects of a pImpl class named Monster (Do as the ints do!) • Write to me if you don’t know how elegance // if we were in C# using System; using System.IO; using static System.Console; // recent C# class Program { static void Main() { Write(File.ReadAllText("z.cs")); } } 39A word about beauty and

>=1.8,<2 • numpy >=1.8,<2|1.9 • numpy 1.8.1 py27_0 • numpy=1.8.1=py27_0 Version ordering The class VersionOrder(object) implements an order relation between version strings. Version strings can contain deprecation. (#14144) • Mark conda.common.compat.six_with_metaclass as pending deprecation. Use class’ metaclass= key- word argument instead. (#14144) • Mark conda.common.compat.open as pending deprecation Chapter 4. Contributors welcome conda, Release 25.1.2.dev1 Other • Add type hinting for VersionOrder class. (#13380) • Re-enable and apply pyupgrade via ruff. (#13272, #13433) • Start tracking performance

>=1.8,<2 • numpy >=1.8,<2|1.9 • numpy 1.8.1 py27_0 • numpy=1.8.1=py27_0 Version ordering The class VersionOrder(object) implements an order relation between version strings. Version strings can contain Release 24.11.3.dev2 • Mark conda.common.compat.six_with_metaclass as pending deprecation. Use class’ metaclass= key- word argument instead. (#14144) • Mark conda.common.compat.open as pending deprecation 4. Contributors welcome conda, Release 24.11.3.dev2 Other • Add type hinting for VersionOrder class. (#13380) • Re-enable and apply pyupgrade via ruff. (#13272, #13433) • Start tracking performance

>=1.8,<2 • numpy >=1.8,<2|1.9 • numpy 1.8.1 py27_0 • numpy=1.8.1=py27_0 Version ordering The class VersionOrder(object) implements an order relation between version strings. Version strings can contain hints and doc strings to conda.cli.main_search. (#13465) Other • Add type hinting for VersionOrder class. (#13380) • Re-enable and apply pyupgrade via ruff. (#13272, #13433) • Start tracking performance (#12948) • Removed conda.core.index.check_whitelist(). (#12948) • Removed conda.core.solve._get_solver_class(). (#12948) • Removed conda.core.subdir_data.read_mod_and_etag(). (#12948) • Removed conda.gateways

>=1.8,<2 • numpy >=1.8,<2|1.9 • numpy 1.8.1 py27_0 • numpy=1.8.1=py27_0 Version ordering The class VersionOrder(object) implements an order relation between version strings. Version strings can contain (#13465) 4.4. Release notes 181 conda, Release 24.7.1 Other • Add type hinting for VersionOrder class. (#13380) • Re-enable and apply pyupgrade via ruff. (#13272, #13433) • Start tracking performance (#12948) • Removed conda.core.index.check_whitelist(). (#12948) • Removed conda.core.solve._get_solver_class(). (#12948) • Removed conda.core.subdir_data.read_mod_and_etag(). (#12948) • Removed conda.gateways