class template

<stack>

LIFO stack

empty

size

back

push_back

pop_back

stack

Stacks are a type of container adaptor, specifically designed to operate in a LIFO context (last-in first-out), where elements are inserted and extracted only from one end of the container.s are implemented as, which are classes that use an encapsulated object of a specific container class as its, providing a specific set of member functions to access its elements. Elements arefrom theof the specific container, which is known as theof the stack.The underlying container may be any of the standard container class templates or some other specifically designed container class. The container shall support the following operations:The standard container classesandfulfill these requirements. By default, if no container class is specified for a particularclass instantiation, the standard containeris used.