Avant-garde C++ / C++11 to C++29

This documentation is a curated, forward-looking map of modern C++, from C++11 foundations to C++29 candidate directions. It is designed for engineers, architects, and learners who need fast orientation, accurate references, and clear context on why each feature exists.

Instead of listing features in isolation, this guide emphasizes evolution: what problem each addition solved, how language and library capabilities converge over time, and where newer constructs refine or replace older patterns. Every detailed entry includes direct cppreference links, motivation, and cross-feature relationships to support deep, practical understanding.

Use this repository as both a study companion and an implementation playbook: to plan migrations, modernize codebases, compare standards, and make better design decisions with confidence.

Language features	Library features
C++ 29 language features (incoming)	C++ 29 library features (incoming)
Contracts Refinements Diagnostics And Safety Profiles Pattern Matching Reflection Extensions static/constexpr Exceptions Follow-Up Tooling-Friendly Language Metadata	Concurrency And Execution Extensions Further Ranges And Mdspan Growth Library Reflection/Meta APIs Numerics And SIMD Expansions Safety-Oriented Library Utilities Text, Unicode, And Formatting Improvements
C++ 26 language features	C++ 26 library features
Attributes For Structured Bindings constexpr Cast From Void* constexpr Exceptions constexpr Placement New constexpr Virtual Inheritance Contracts Delete With Reason Embed Directive Expansion Statements Pack Indexing Placeholder Variables With No Name Reflection Structured Binding Declaration As A Condition Structured Bindings Can Introduce A Pack Unevaluated Strings User-Generated static_assert Messages Variadic Friends	Execution Control Library Hazard Pointers Hive Container Linear Algebra Library Meta Reflection Library Support Read-Copy-Update (RCU) SIMD Data-Parallel Types std::copyable_function std::function_ref std::indirect std::inplace_vector std::optional<T&> std::optional Range Support std::philox_engine std::polymorphic std::span::at std::text_encoding std::views::concat std::views::indices
C++ 23 language features	C++ 23 library features
consteval if Deducing this Increasing Range-Based For Safety Multidimensional Subscript Operator Simpler Implicit Move	Contains For Strings And String Views std::flat_map And std::flat_set Input/Output Pointers Monadic Operations For std::optional std::spanstream Stacktrace Library std::byteswap std::expected std::mdspan std::move_only_function std::print And std::println std::ranges::to std::to_underlying std::unreachable
C++ 20 language features	C++ 20 library features
[[likely]] And [[unlikely]] Attributes __VA_OPT__ Abbreviated Function Templates char8_t Class Types In Non-Type Template Parameters Concepts constinit constexpr Virtual Functions Coroutines Deprecate Implicit Capture Of this Designated Initializers explicit(bool) Immediate Functions Lambda Capture Of Parameter Pack Modules Range-Based For Loop With Initializer Template Syntax For Lambdas Three-Way Comparison using enum	Bit Operations Calendar And Time Zone Library Check If Associative Container Has Element Concepts Library Latches, Barriers And Semaphores Math Constants Ranges Library Safe Integral Comparisons starts_with And ends_with On Strings std::bind_front std::bit_cast std::is_constant_evaluated std::jthread std::lexicographical_compare_three_way std::make_shared Supports Arrays std::midpoint std::source_location std::span std::stop_token std::to_array Synchronized Buffered Outputstream Text Formatting Three-Way Comparison Helpers Uniform Container Erasure
C++ 17 language features	C++ 17 library features
Class Template Argument Deduction constexpr If constexpr Lambda Declaring Non-Type Template Parameters With auto Direct-List-Initialization Of Enums [[fallthrough]] Attribute [[nodiscard]] Attribute [[maybe_unused]] Attribute Folding Expressions Guaranteed Copy Elision __has_include inline Variables Lambda Capture this By Value Nested Namespaces New Rules For auto Deduction From Braced-Init-List Selection Statements With Initializer Structured Bindings Template Argument Deduction For Class Templates UTF-8 Character Literals	GCD And LCM Parallel Algorithms Polymorphic Memory Resources Prefix Sum Algorithms Rounding Functions For Chrono Durations And Timepoints Searchers Splicing For Maps And Sets std::any std::apply std::byte std::clamp std::filesystem std::from_chars And std::to_chars std::invoke std::not_fn std::optional std::reduce std::sample std::string_view std::variant String Conversion To/From Numbers
C++ 14 language features	C++ 14 library features
[[deprecated]] Attribute Binary Literals decltype(auto) Digit Separators Generic Lambda Expressions Lambda Capture Initializers Relaxing Constraints On constexpr Functions Return Type Deduction Sized Deallocation Variable Templates	Compile-Time Integer Sequences Shared Locking Primitives std::exchange std::make_unique std::quoted User-Defined Literals For Standard Library Types
C++ 11 language features	C++ 11 library features
alignas And alignof Attributes auto char32_t And char16_t constexpr Converting Constructors decltype default Functions Delegating Constructors deleted Functions explicit Conversion Functions explicit Virtual Overrides final Specifier Forwarding References Inheriting Constructors Initializer Lists & Uniform Initialization inline Namespaces Lambda Expressions Move Semantics and Special Methods noexcept Specifier Non-static Data Member Initializers nullptr Range-Based For Loops Raw String Literals Ref-Qualified Member Functions Right Angle Brackets Rvalue References static_assert Strongly-Typed Enums thread_local Trailing Return Types Type Aliases User-Defined Literals Variadic Templates	Atomic Library Condition Variables Futures And Promises Memory Model Random Number Library Regex Library Smart Pointers (smart, shared and weak) std::array std::async std::begin/end std::chrono std::forward std::function std::make_shared std::move std::ref std::thread std::tie std::to_string Tuples Type Traits Unordered Containers

Topics

• const Related Qualifiers
• Modern Error Handling Paradigms: Exceptions, Monadic Types, and Contracts
• Modern Thread Synchronization and Lock-Free Execution in C++20/23/26
• Polymorphic Memory Resources (PMR) and Arena Allocation Strategies
• Structured Asynchrony with Senders and Receivers (P2300 / C++26)
• Taxonomy and Mechanics of C++ Value Categories: Identity, Resources, and Expression Semantics
• The Compile-Time Metaprogramming Revolution: From SFINAE to Reflection
• Type Erasure and Polymorphism without Virtual Dispatch
• Value Categories, Lifetime Extension, and Temporary Dangling Pitfalls