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
59
60
61
62
63
64
65
66
|
#include <stc/cstr.h>
typedef struct Viking {
cstr name;
cstr country;
} Viking;
void Viking_drop(Viking* vk) {
cstr_drop(&vk->name);
cstr_drop(&vk->country);
}
// Define Viking lookup struct with hash, cmp, and convertion functions between Viking and RViking structs:
typedef struct RViking {
const char* name;
const char* country;
} RViking;
static inline int RViking_cmp(const RViking* rx, const RViking* ry) {
int c = strcmp(rx->name, ry->name);
return c ? c : strcmp(rx->country, ry->country);
}
static inline Viking Viking_from(RViking raw) { // note: parameter is by value
return c_COMPOUND(Viking){cstr_from(raw.name), cstr_from(raw.country)};
}
static inline RViking Viking_toraw(const Viking* vp) {
return c_COMPOUND(RViking){cstr_str(&vp->name), cstr_str(&vp->country)};
}
// With this in place, we define the Viking => int hash map type:
#define i_type Vikings
#define i_keyclass Viking // key type
#define i_rawclass RViking // lookup type
#define i_keyfrom Viking_from
#define i_opt c_no_clone
#define i_hash(rp) cstrhash(rp->name) ^ cstrhash(rp->country)
#define i_val int // mapped type
#include <stc/cmap.h>
/*
i_keyclass implies these defines, unless they are already defined:
i_cmp => RViking_cmp
//i_hash => RViking_hash // already defined.
//i_keyclone => Viking_clone // not used, because of c_no_clone
i_keyto => Viking_toraw // because i_rawclass is defined
i_keydrop => Viking_drop
*/
int main()
{
c_AUTO (Vikings, vikings) {
Vikings_emplace(&vikings, (RViking){"Einar", "Norway"}, 20);
Vikings_emplace(&vikings, (RViking){"Olaf", "Denmark"}, 24);
Vikings_emplace(&vikings, (RViking){"Harald", "Iceland"}, 12);
Vikings_emplace(&vikings, (RViking){"Björn", "Sweden"}, 10);
Vikings_value* v = Vikings_get_mut(&vikings, (RViking){"Einar", "Norway"});
v->second += 3; // add 3 hp points to Einar
c_FORPAIR (vk, hp, Vikings, vikings) {
printf("%s of %s has %d hp\n", cstr_str(&_.vk->name), cstr_str(&_.vk->country), *_.hp);
}
}
}
|
