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From: FJB	4/7/2021 11:09:31 AM
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All C++20 core language features with examples Apr 2, 2021 Introduction The story behind this article is very simple, I wanted to learn about new C++20 language features and to have a brief summary for all of them on a single page. So, I decided to read all proposals and create this “cheat sheet” that explains and demonstrates each feature. This is not a “best practices” kind of article, it serves only demonstrational purpose. Most examples were inspired or directly taken from corresponding proposals, all credit goes to their authors and to members of ISO C++ committee for their work. Enjoy! Table of contents Concepts Modules Coroutines Three-way comparison Lambda expressions Allow lambda-capture [=, this] Template parameter list for generic lambdas Lambdas in unevaluated contexts Default constructible and assignable stateless lambdas Pack expansion in lambda init-capture Constant expressions Immediate functions(consteval) constexpr virtual function constexpr try-catch blocks constexpr dynamic_cast and polymorphic typeid Changing the active member of a union inside constexpr constexpr allocations Trivial default initialization in constexpr functions Unevaluated asm-declaration in constexpr functions std::is_constant_evaluated() Aggregates Prohibit aggregates with user-declared constructors Class template argument deduction for aggregates Parenthesized initialization of aggregates Non-type template parameters Class types in non-type template parameters Generalized non-type template parameters Structured bindings Lambda capture and storage class specifiers for structured bindings Relaxing the structured bindings customization point finding rules Allow structured bindings to accessible members Range-based for loop init-statements for range-based for loop Relaxing the range-based for loop customization point finding rules Attributes [[likely]] and [[unlikely]] [[no_unique_address]] [[nodiscard]] with message [[nodiscard]] for constructors Character encoding char8_t Stronger Unicode requirements Sugar Designated initializers Default member initializers for bit-fields More optional typename Nested inline namespaces using enum Array size deduction in new-expressions Class template argument deduction for alias templates constinit Signed integers are two’s complement __VA_OPT__ for variadic macros Explicitly defaulted functions with different exception specifications Destroying operator delete Conditionally explicit constructors Feature-test macros Known-to-unknown bound array conversions Implicit move for more local objects and rvalue references Conversion from T* to bool is narrowing Deprecate some uses of volatile Deprecate comma operator in subscripts Fixes Initializer list constructors in class template argument deduction const&-qualified pointers to members Simplifying implicit lambda capture const mismatch with defaulted copy constructor Access checking on specializations ADL and function templates that are not visible Specify when constexpr function definitions are needed for constant evaluation Implicit creation of objects for low-level object manipulation

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