C and C++ reference

C++ reference C++11, C++14, C++17, C++20, C++23, C++26  │  Compiler support C++11, C++14, C++17, C++20, C++23, C++26
Language Preprocessor − Comments ASCII chart Basic concepts     Keywords     Names (lookup)     Types (fundamental types)     The main function     Modules (C++20)     Contracts (C++26) Expressions     Value categories     Evaluation order     Operators (precedence)     Conversions − Literals     Constant expressions Statements     if − switch     for − range-for (C++11)     while − do-while Declarations − Initialization Functions − Overloading Coroutines (C++20) Classes (unions) Templates − Exceptions Freestanding implementations Standard library (headers) Named requirements Language support library Program utilities     Signals − Non-local jumps Basic memory management Variadic functions source_location (C++20) Comparison utilities (C++20) Type support − type_info numeric_limits − exception initializer_list (C++11) Coroutine support (C++20) Contract support (C++26) Concepts library (C++20)	Diagnostics library Assertions − System error (C++11) Exception types − Error numbers basic_stacktrace (C++23) Debugging support (C++26) Memory management library Allocators − Smart pointers Memory resources (C++17) Metaprogramming library (C++11) Type traits − ratio integer_sequence (C++14) General utilities library Function objects − hash (C++11) Swap − Type operations (C++11) Integer comparison (C++20) pair − tuple (C++11) optional (C++17) expected (C++23) variant (C++17) − any (C++17) bitset − Bit manipulation (C++20) Containers library vector − deque − array (C++11) list − forward_list (C++11) inplace_vector (C++26) hive (C++26) map − multimap − set − multiset unordered_map (C++11) unordered_multimap (C++11) unordered_set (C++11) unordered_multiset (C++11) Container adaptors span (C++20) − mdspan (C++23) Iterators library Ranges library (C++20) Range factories − Range adaptors generator (C++23) Algorithms library Numeric algorithms Execution policies (C++17) Constrained algorithms (C++20)	Strings library basic_string − char_traits basic_string_view (C++17) Text processing library Primitive numeric conversions (C++17) Formatting (C++20) − Localization text_encoding (C++26) Regular expressions (C++11)     basic_regex − Algorithms     Default regular expression grammar Null-terminated sequence utilities:     byte − multibyte − wide Numerics library Common math functions Mathematical special functions (C++17) Mathematical constants (C++20) Basic linear algebra algorithms (C++26) Data-parallel types (SIMD) (C++26) Pseudo-random number generation Floating-point environment (C++11) complex − valarray Date and time library Calendar (C++20) − Time zone (C++20) Input/output library Print functions (C++23) Stream-based I/O − I/O manipulators basic_istream − basic_ostream Synchronized output (C++20) File systems (C++17) Concurrency support library (C++11) thread − jthread (C++20) atomic − atomic_flag atomic_ref (C++20) − memory_order Mutual exclusion − Condition variables Futures − Semaphores (C++20) latch (C++20) − barrier (C++20) Safe Reclamation (C++26) Execution support library (C++26) Feature test macros (C++20) Language − Standard library − Headers
Technical specifications     Standard library extensions  (library fundamentals TS)     resource_adaptor − invocation_type     Standard library extensions v2  (library fundamentals TS v2)     propagate_const − ostream_joiner − randint     observer_ptr − Detection idiom     Standard library extensions v3  (library fundamentals TS v3)     scope_exit − scope_fail − scope_success − unique_resource		Parallelism library extensions v2 (parallelism TS v2) simd Concurrency library extensions (concurrency TS) Transactional Memory  (TM TS) Reflection  (reflection TS)
External Links  −  Non-ANSI/ISO Libraries  −  Index  −  std Symbol Index
C reference C89, C95, C99, C11, C17, C23  │  Compiler support C99, C23
Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers Type support	Program utilities Variadic functions Diagnostics library Dynamic memory management Strings library Null-terminated strings:    byte  −   multibyte  −   wide Date and time library Localization library Input/output library	Algorithms library Numerics library Common mathematical functions Floating-point environment (C99) Pseudo-random number generation Complex number arithmetic (C99) Type-generic math (C99) Bit manipulation (C23) Checked integer arithmetic (C23) Concurrency support library (C11)
Technical specifications    Dynamic memory extensions  (dynamic memory TR)    Floating-point extensions, Part 1  (FP Ext 1 TS)    Floating-point extensions, Part 4  (FP Ext 4 TS)
External Links  −  Non-ANSI/ISO Libraries  −  Index  −  Symbol Index

News

17 April 2026: It took a while, but with a lot of help from the folks at isocpp.org, we're back! Sorry for the delay, and thank you for your patience.