(in libkernel) the module to realize a stack with integer elements
the class of stack with integer elements
| procedure, public :: push | push an integer into a stack |
| procedure, public :: pop | pop an integer out of a stack |
| procedure, public :: top | return the top of a stack |
| procedure, public :: num | return the number of elements in a stack |
| procedure, public :: clean | clean a stack |
| procedure, public :: read | read a stack from a file |
| procedure, public :: write | save a stack to a file |
| procedure, public :: consistent | check if a stack is consistent |
| procedure, public :: items | public only for test, don't use |
| generic, public :: assignment(=) => copy | assignment of a stack |
| generic, public :: operator(==) => compare | check if two stacks are equal |