NAME

       Stack - Last-in first-out stacks.

Module

       Module   Stack

Documentation

       Module Stack
        : sig end

       Last-in first-out stacks.

       This module implements stacks (LIFOs), with in-place modification.

       type 'a t

       The type of stacks containing elements of type 'a .

       exception Empty

       Raised when Stack.pop or Stack.top is applied to an empty stack.

       val create : unit -> 'a t

       Return a new stack, initially empty.

       val push : 'a -> 'a t -> unit

       push x s adds the element x at the top of stack s .

       val pop : 'a t -> 'a

       pop s removes and returns the topmost element in stack s , or raises Stack.Empty if the stack is empty.

       val top : 'a t -> 'a

       top s returns the topmost element in stack s , or raises Stack.Empty if the stack is empty.

       val clear : 'a t -> unit

       Discard all elements from a stack.

       val copy : 'a t -> 'a t

       Return a copy of the given stack.

       val is_empty : 'a t -> bool

       Return true if the given stack is empty, false otherwise.

       val length : 'a t -> int

       Return the number of elements in a stack. Time complexity O(1)

       val iter : ('a -> unit) -> 'a t -> unit

       iter f s applies f in turn to all elements of s , from the element at the top of the stack to the element
       at the bottom of the stack. The stack itself is unchanged.

       val fold : ('b -> 'a -> 'b) -> 'b -> 'a t -> 'b

       fold f accu s is (f (... (f (f accu x1) x2) ...) xn) where x1 is the top of  the  stack,  x2  the  second
       element, and xn the bottom element. The stack is unchanged.

       Since 4.03