std::stack

 

C++

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Named requirements

Feature test macros (C++20)

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Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

deque

forward_list (C++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

Views

span (C++20)

 

std::stack

Member functions

stack::stack

stack::~stack

stack::operator=

Element access

stack::top

Capacity

stack::empty

stack::size

Modifiers

stack::push

stack::emplace (C++11)

stack::pop

stack::swap (C++11)

Non-member functions

operator==operator!=operator<operator>operator<=operator>=operator<=> (C++20)

std::swap (C++11)

Deduction guides(C++17)

 

Defined in header <stack>
template<     class T,     class Container = std::deque<T> > class stack;

The std::stack class is a container adaptor that gives the programmer the functionality of a stack - specifically, a LIFO (last-in, first-out) data structure.

The class template acts as a wrapper to the underlying container - only a specific set of functions is provided. The stack pushes and pops the element from the back of the underlying container, known as the top of the stack.

Template parameters

T	-	The type of the stored elements. The behavior is undefined if T is not the same type as Container::value_type. (since C++17)
Container	-	The type of the underlying container to use to store the elements. The container must satisfy the requirements of SequenceContainer. Additionally, it must provide the following functions with the usual semantics: back() push_back() pop_back() The standard containers std::vector, std::deque and std::list satisfy these requirements. By default, if no container class is specified for a particular stack class instantiation, the standard container std::deque is used.

Member types

Member type	Definition
container_type	Container
value_type	Container::value_type
size_type	Container::size_type
reference	Container::reference
const_reference	Container::const_reference

Member functions

(constructor)	constructs the stack (public member function)
(destructor)	destructs the stack (public member function)
operator=	assigns values to the container adaptor (public member function)
Element access
top	accesses the top element (public member function)
Capacity
empty	checks whether the underlying container is empty (public member function)
size	returns the number of elements (public member function)
Modifiers
push	inserts element at the top (public member function)
emplace (C++11)	constructs element in-place at the top (public member function)
pop	removes the top element (public member function)
swap (C++11)	swaps the contents (public member function)
Member objects
Container c	the underlying container (protected member object)

Non-member functions

operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20)	lexicographically compares the values in the stack (function template)
std::swap(std::stack) (C++11)	specializes the std::swap algorithm (function template)

Helper classes

std::uses_allocator<std::stack> (C++11)

specializes the std::uses_allocator type trait (class template specialization)