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C and C++ reference

From cppreference.com

C++ reference
C++98, C++03, C++11

Language

Headers

Concepts

Utilities library

Strings library

Containers library

array (C++11)  −  vector  −  deque
list  −  forward_list (C++11)
set  −  multiset
map  −  multimap
unordered_set (C++11)
unordered_multiset (C++11)
unordered_map (C++11)
unordered_multimap (C++11)
stack  −  queue  −  priority_queue

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expression library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

C reference
C89, C99, C11

Language

Headers

Type support

Dynamic memory management

Error handling

Program utilities

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support