source: doc/papers/general/evaluation/cfa-stack.c @ deb52a0

#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 ?{}( stack(T) & s, stack(T) t ) {
        stack_node(T) ** crnt = &s.head;
        for ( stack_node(T) * next = t.head; next; next = next->next ) {
                *crnt = alloc();
                ((*crnt)->value){ next->value };
                crnt = &(*crnt)->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 ) with( s ) {
        stack_node(T)* n = alloc();
        (*n){ value, head };
        head = n;
}

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

forall(otype T) void clear( stack(T) & s ) with( s ) {
        for ( stack_node(T) * next = head; next; ) {
                stack_node(T) * crnt = next;
                next = crnt->next;
                ^(*crnt){};
                free(crnt);
        }
        head = 0;
}