C and C++ reference

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

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)

Assertions  System error (C++11)
Exception types  Error numbers
basic_stacktrace (C++23)
Debugging support (C++26)

Allocators  Smart pointers
Memory resources (C++17)

Type traits  ratio
integer_sequence (C++14)
Reflection (C++26)

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)

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)

Range factories  Range adaptors
generator (C++23)

Numeric algorithms
Execution policies (C++17)
Constrained algorithms (C++20)

basic_string  char_traits
basic_string_view (C++17)

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

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

Calendar (C++20)  Time zone (C++20)

Print functions (C++23)
Stream-based I/O  I/O manipulators
basic_istream  basic_ostream
Synchronized output (C++20)
File systems (C++17)

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)

Language  Standard library  Headers

    resource_adaptor  invocation_type

    propagate_const  ostream_joiner  randint
    observer_ptr  Detection idiom

    scope_exit  scope_fail  scope_success  unique_resource

simd

Basic concepts
Keywords
Preprocessor
Expressions
Declaration
Initialization
Functions
Statements

Null-terminated strings:
   byte     multibyte     wide

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)