NAME

std::stack - std::stack

Synopsis

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

The type of the stored elements.
T - The behavior is undefined if T is not the same type as
Container::value_type.
(since C++17)
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()
Container - * 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 constructs element in-place at the top
(C++11) (public member function)
pop removes the top element
(public member function)
swap swaps the contents
(C++11) (public member function)

Member objects

Container c the underlying container
(protected member object)

Non-member functions

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

Helper classes

std::uses_allocator<std::stack> specializes the std::uses_allocator type trait
(C++11) (class template specialization)

Deduction guides(since C++17)