source: doc/generic_types/evaluation/cfa-stack.c@ 65cb413

#include <assert>
#include <stdlib>
#include "cfa-stack.h"

forall(otype T) struct stack_node {
        T value;
        stack_node(T)* next;
};

forall(otype T) void ?{}(stack(T)* s) {
        (&s->head){ 0 };
}

forall(otype T) void copy(stack(T)* s, stack(T)* t) {
        stack_node(T)** crnt = &s->head;
        stack_node(T)* next = t->head;
        while ( next ) {
                *crnt = ((stack_node(T)*)malloc()){ next->value };
                stack_node(T)* acrnt = *crnt;
                crnt = &acrnt->next;
                next = next->next;
        }
        *crnt = 0;
}

forall(otype T) void ?{}(stack(T)* s, stack(T) t) {
        stack_node(T)** crnt = &s->head;
        stack_node(T)* next = t.head;
        while ( next ) {
                *crnt = ((stack_node(T)*)malloc()){ next->value };
                stack_node(T)* acrnt = *crnt;
                crnt = &acrnt->next;
                next = next->next;
        }
        *crnt = 0;
}

forall(otype T) stack(T) ?=?(stack(T)* s, stack(T) t) {
        if ( s->head == t.head ) return *s;
        clear(s);
        s{ t };
        return *s;
}

forall(otype T) void ^?{}(stack(T)* s) {
        clear(s);
}

forall(otype T) _Bool empty(const stack(T)* s) {
        return s->head == 0;
}

forall(otype T) void push(stack(T)* s, T value) {
        s->head = ((stack_node(T)*)malloc()){ value, s->head };
}

forall(otype T) T pop(stack(T)* s) {
        stack_node(T)* n = s->head;
        s->head = n->next;
        T x = n->value;
        ^n{};
        free(n);
        return x;
}

forall(otype T) void clear(stack(T)* s) {
        stack_node(T)* next = s->head;
        while ( next ) {
                stack_node(T)* crnt = next;
                next = crnt->next;
                delete(crnt);
        }
        s->head = 0;
}