std::vector

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C++ Standard Library
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Containers library
array (C++11) vector deque forward_list (C++11) list set multiset map multimap unordered_set (C++11) unordered_multiset (C++11) unordered_map (C++11) unordered_multimap (C++11) stack queue priority_queue
std::vector
Member functions vector::vector vector::~vector vector::operator= vector::assign vector::get_allocator Element access vector::at vector::operator[] vector::front vector::back vector::data Iterators vector::begin vector::cbegin (C++11) vector::end vector::cend (C++11) vector::rbegin vector::crbegin (C++11) vector::rend vector::crend (C++11) Capacity vector::empty vector::size vector::max_size vector::reserve vector::capacity vector::shrink_to_fit (C++11) Modifiers vector::clear vector::insert vector::emplace (C++11) vector::erase vector::push_back vector::emplace_back (C++11) vector::pop_back vector::resize vector::swap

Defined in header <vector>
template<     class T,     class Allocator = std::allocator<T> > class vector;

std::vector is a container that supports fast random access to the elements and fast insertion or removal of elements at the end of the container. Fast element insertion or removal in the middle of the container is not supported. It is implemented as an contiguous array, which means that pointer arithmetic is fully supported, and a pointer to an element of a vector may be passed to any C function that expects a pointer to an element of an array.

Contents 1 Member types 2 Member functions 2.1 Element access 2.2 Iterators 2.3 Capacity 2.4 Modifiers 3 Non-member functions

[edit] Member types

Member type	Definition
value_type	T
allocator_type	Allocator
size_type	Unsigned integral type (usually size_t)
difference_type	Signed integer type (usually ptrdiff_t)
reference	Allocator::reference (pre-C++11 version) value_type& (C++11 version)
const_reference	Allocator::const_reference (pre-C++11 version) const value_type& (C++11 version)
pointer	T* (pre-C++11 version) std::allocator_traits<Allocator>::pointer (C++11 version)
const_pointer	const T* (pre-C++11 version) std::allocator_traits<Allocator>::const_pointer (C++11 version)
iterator	Random access iterator
const_iterator	Constant random access iterator
reverse_iterator	std::reverse_iterator<iterator>
const_reverse_iterator	std::reverse_iterator<const_iterator>

[edit] Member functions

(constructor)	constructs the vector (public member function)
(destructor)	destructs the vector (public member function)
operator=	assigns values to the container (public member function)
assign	assigns values to the container (public member function)
get_allocator	returns the associated allocator (public member function)
Element access
at	access specified element with bounds checking (public member function)
operator[]	access specified element (public member function)
front	access the first element (public member function)
back	access the last element (public member function)
data	direct access to the underlying array (public member function)
Iterators
begin cbegin	returns an iterator to the beginning (public member function)
end cend	returns an iterator to the end (public member function)
rbegin crbegin	returns a reverse iterator to the beginning (public member function)
rend crend	returns a reverse iterator to the end (public member function)
Capacity
empty	checks whether the container is empty (public member function)
size	returns the number of elements (public member function)
max_size	returns the maximum possible number of elements (public member function)
reserve	reserves storage (public member function)
capacity	returns the number of elements that can be held in currently allocated storage (public member function)
shrink_to_fit (C++11)	reduces memory usage by freeing unused memory (public member function)
Modifiers
clear	clears the contents (public member function)
insert	inserts elements (public member function)
emplace (C++11)	constructs element in-place (public member function)
erase	erases elements (public member function)
push_back	inserts elements to the end (public member function)
emplace_back (C++11)	constructs elements in-place at the end (public member function)
pop_back	removes the last element (public member function)
resize	changes the number of elements stored (public member function)
swap	swaps the contents (public member function)

[edit] Non-member functions

operator== operator!= operator< operator<= operator> operator>=	lexicographically compares the values in the container (function)
std::swap(std::vector)	specializes the std::swap() algorithm (function template)