source:
doc/generic_types/evaluation/cfa-stack.c
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d87ade9
Last change on this file since d87ade9 was a381b46, checked in by , 7 years ago | |
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File size: 1.1 KB |
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[309be81] | 1 | #include <stdlib> |
2 | #include "cfa-stack.h" | |
3 | ||
4 | forall(otype T) struct stack_node { | |
5 | T value; | |
6 | stack_node(T)* next; | |
7 | }; | |
8 | ||
[a381b46] | 9 | forall(otype T) void ?{}(stack(T)* s) { (&s->head){ 0 }; } |
[d919f47] | 10 | |
[122aecd] | 11 | forall(otype T) void ?{}(stack(T)* s, stack(T) t) { |
12 | stack_node(T)** crnt = &s->head; | |
13 | stack_node(T)* next = t.head; | |
[309be81] | 14 | while ( next ) { |
[3fb7f5e] | 15 | *crnt = ((stack_node(T)*)malloc()){ next->value }; /***/ |
[122aecd] | 16 | stack_node(T)* acrnt = *crnt; |
17 | crnt = &acrnt->next; | |
18 | next = next->next; | |
[309be81] | 19 | } |
[122aecd] | 20 | *crnt = 0; |
21 | } | |
22 | ||
23 | forall(otype T) stack(T) ?=?(stack(T)* s, stack(T) t) { | |
24 | if ( s->head == t.head ) return *s; | |
25 | clear(s); | |
26 | s{ t }; | |
27 | return *s; | |
28 | } | |
29 | ||
[a381b46] | 30 | forall(otype T) void ^?{}(stack(T)* s) { clear(s); } |
[309be81] | 31 | |
[a381b46] | 32 | forall(otype T) _Bool empty(const stack(T)* s) { return s->head == 0; } |
[309be81] | 33 | |
34 | forall(otype T) void push(stack(T)* s, T value) { | |
[3fb7f5e] | 35 | s->head = ((stack_node(T)*)malloc()){ value, s->head }; /***/ |
[309be81] | 36 | } |
37 | ||
38 | forall(otype T) T pop(stack(T)* s) { | |
39 | stack_node(T)* n = s->head; | |
40 | s->head = n->next; | |
41 | T x = n->value; | |
[65cb413] | 42 | ^n{}; |
43 | free(n); | |
[309be81] | 44 | return x; |
45 | } | |
[122aecd] | 46 | |
47 | forall(otype T) void clear(stack(T)* s) { | |
48 | stack_node(T)* next = s->head; | |
49 | while ( next ) { | |
50 | stack_node(T)* crnt = next; | |
51 | next = crnt->next; | |
52 | delete(crnt); | |
53 | } | |
[d919f47] | 54 | s->head = 0; |
[122aecd] | 55 | } |
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