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C and C++ reference

From cppreference.com

C++ reference
C++98, C++03, C++11, C++14, C++17, C++20

Language

Headers −  Library concepts

Language support library

Diagnostics library

General utilities library

Smart pointers and allocators
Date and time
Function objects  −  hash (C++11)
String conversions (C++17)
Utility functions
pair  −   tuple (C++11)
optional (C++17)  −  any (C++17)
variant (C++17)

Strings library

basic_string
basic_string_view (C++17)
Null-terminated strings:
   byte  −   multibyte  −   wide

Containers library

Iterators library

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical specifications

   Standard library extensions  (library fundamentals TS)
   Standard library extensions v2  (library fundamentals TS v2)

   Parallelism library extensions  (parallelism TS)
   Concurrency library extensions  (concurrency TS)
   Concepts  (concepts TS)
   Ranges  (ranges TS)
   Transactional Memory  (TM TS)
Feature Test Recommendations

External Links  −  Non-ANSI/ISO Libraries  −  Index  −  std Symbol Index

C reference
C89, C95, C99, C11, C17

Language

Headers

Type support

Dynamic memory management

Error handling

Program utilities

Variadic functions

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Atomic operations library (C11)

Thread 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
News
  • 1 December 2017: ISO C++17 published.
  • 9 April 2017: New version of the offline archive.
    The Debian and Ubuntu packages will be updated to this version.