Standard Library Containers Standard Containers std:: Containers

array<T,size>

fixed-size contiguous array

vector<T>

dynamic contiguous array; amortized O(1) growth strategy;
C++'s default container

deque<T>

double-ended queue; fast insert/erase at both ends

list<T>

doubly-linked list; O(1) insert, erase & splicing; in practice often slower than vector

forward_list<T>

singly-linked list; O(1) insert, erase & splicing; needs less memory than list; in practice often slower than vector

set<Key>

stores unique keys; sorted by keys

map<Key,Value>

stores unique key→value-pairs; sorted by keys

unordered_set<Key>

stores unique keys; hashed by keys

unordered_map<Key,Value>

stores unique key→value-pairs; hashed by keys

pair<A,B>

contains 2 values of same or different type

tuple<A,B,C,…>

contains many values of same or different type

optional<T>

contains either one value of type T or no value

variant<A,B,C,…>

contains one value of either type A or type B or type C, …

any

contains one value of any