1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
#include <metalang99/assert.h>
#include <metalang99/maybe.h>
#include <metalang99/nat.h>
int main(void) {
#define MATCH_IMPL(maybe) ML99_match(v(maybe), v(MATCH_))
#define MATCH_just_IMPL(x) v(ML99_ASSERT_UNEVAL(x == 87))
#define MATCH_nothing_IMPL(_) v(ML99_ASSERT_UNEVAL(1))
// Pattern matching
{
ML99_EVAL(ML99_call(MATCH, ML99_just(v(87))));
ML99_EVAL(ML99_call(MATCH, ML99_nothing(~, ~, ~)));
}
#undef MATCH_IMPL
#undef MATCH_just_IMPL
#undef MATCH_nothing_IMPL
#define VAL v(abc ? +-148 % "hello world")
// ML99_isJust
{
ML99_ASSERT(ML99_isJust(ML99_just(VAL)));
ML99_ASSERT(ML99_not(ML99_isJust(ML99_nothing())));
}
// ML99_IS_JUST
{
ML99_ASSERT_UNEVAL(ML99_IS_JUST(ML99_JUST(VAL)));
ML99_ASSERT_UNEVAL(!ML99_IS_JUST(ML99_NOTHING()));
}
// ML99_isNothing
{
ML99_ASSERT(ML99_isNothing(ML99_nothing()));
ML99_ASSERT(ML99_not(ML99_isNothing(ML99_just(VAL))));
}
// ML99_IS_NOTHING
{
ML99_ASSERT_UNEVAL(ML99_IS_NOTHING(ML99_NOTHING()));
ML99_ASSERT_UNEVAL(!ML99_IS_NOTHING(ML99_JUST(VAL)));
}
// ML99_maybeEq
{
ML99_ASSERT(ML99_maybeEq(v(ML99_natEq), ML99_just(v(123)), ML99_just(v(123))));
ML99_ASSERT(ML99_not(ML99_maybeEq(v(ML99_natEq), ML99_just(v(123)), ML99_just(v(4)))));
ML99_ASSERT(ML99_not(ML99_maybeEq(v(ML99_natEq), ML99_just(v(123)), ML99_nothing())));
ML99_ASSERT(ML99_not(ML99_maybeEq(v(ML99_natEq), ML99_nothing(), ML99_just(v(123)))));
}
// ML99_maybeUnwrap
{ ML99_ASSERT_EQ(ML99_maybeUnwrap(ML99_just(v(123))), v(123)); }
}
|
