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Showing content from https://en.cppreference.com/w/cpp/language/../keyword/../container/stack.html below:

std::stack - cppreference.com

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.

All member functions of std::stack are constexpr: it is possible to create and use std::stack objects in the evaluation of a constant expression.

However, std::stack objects generally cannot be constexpr, because any dynamically allocated storage must be released in the same evaluation of constant expression.

(since C++26) [edit] Template parameters T - The type of the stored elements. The program is ill-formed if T is not the same type as Container::value_type. 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(), e.g., std::vector::back(),
push_back(), e.g., std::deque::push_back(),
pop_back(), e.g., std::list::pop_back().

The standard containers std::vector (including std::vector<bool>), 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.

[edit] Member types Type Definition container_type Container[edit] value_type Container::value_type[edit] size_type Container::size_type[edit] reference Container::reference[edit] const_reference Container::const_reference[edit] [edit] Member objects Member Description the underlying container
(protected member object) [edit] [edit] Member functions constructs the stack
(public member function) [edit] destructs the stack
(public member function) [edit] assigns values to the container adaptor
(public member function) [edit] Element access accesses the top element
(public member function) [edit] Capacity checks whether the container adaptor is empty
(public member function) [edit] returns the number of elements
(public member function) [edit] Modifiers inserts element at the top
(public member function) [edit] inserts a range of elements at the top
(public member function) [edit] constructs element in-place at the top
(public member function) [edit] removes the top element
(public member function) [edit] swaps the contents
(public member function) [edit] [edit] Non-member functions [edit] Helper classes [edit] Notes [edit] Example [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 307 C++98 Container could not be std::vector<bool> allowed LWG 2566 C++98 Missing the requirement for Container::value_type ill-formed if T is not the same type as Container::value_type [edit] See also

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