Magomed Kostoev (mkostoevr)
0b8e3382ef
git-svn-id: svn://kolibrios.org@8601 a494cfbc-eb01-0410-851d-a64ba20cac60
89 lines
2.1 KiB
Markdown
89 lines
2.1 KiB
Markdown
# CDict - a simple dictionary implementation in C
|
|
## Ready to use!
|
|
|
|
It may be used out of the box with key and value of type `CStr` (which is `char *` - zero-terminated string). Once it instantiated in some file using `CDICT_INST` definition:
|
|
|
|
```C
|
|
#define CDICT_INST
|
|
#include "cdict.h"
|
|
```
|
|
|
|
It may be then declared just using `#include`:
|
|
|
|
```C
|
|
#include "cdict.h"
|
|
|
|
int main() {
|
|
CDict_CStr_CStr dict;
|
|
if (!cdict_CStr_CStr_init(&dict)) {
|
|
printf("CDict returned error #%d", dict.error_code);
|
|
return 0;
|
|
}
|
|
cdict_CStr_CStr_add_vv(&dict, "key_a", "value_a", CDICT_REPLACE_EXIST);
|
|
printf("[key_a] = \"%s\"\n", cdict_CStr_CStr_get_v(&dict, "key_a"));
|
|
}
|
|
```
|
|
|
|
## Easy to configure!
|
|
|
|
If you want to create a dictionary for other key types you should provide your own keys hashing and comparsion functions, in such case the instantiation of the library will look like this:
|
|
|
|
```C
|
|
#define CDICT_INST
|
|
#define CDICT_KEY_T MyType
|
|
#define CDICT_HASH_FN(pkey) my_hash(pkey)
|
|
#define CDICT_CMP_FN(pkey0, pkey1) my_cmp(pkey0, pkey1)
|
|
#include "cdict.h"
|
|
|
|
int my_cmp(MyType *pkey0, MyType *pkey1) {
|
|
// Return `whatever_negative` if `key0 < key1`, `0` if `key0 == key1` and `whatever_positive` if `key0 > key1`
|
|
}
|
|
|
|
unsigned long my_hash(MyType *key) {
|
|
// Return the hash of the key
|
|
}
|
|
```
|
|
|
|
Then to use the new dictionary you only need to define key type before the header inclusion:
|
|
|
|
```C
|
|
#define CDICT_KEY_T MyType
|
|
#include "cdict.h"
|
|
|
|
// ...
|
|
CDict_MyType_CStr dict;
|
|
cdict_MyType_CStr_init(&dict);
|
|
// ...
|
|
```
|
|
|
|
If you want to specify the type of values - just define the type:
|
|
|
|
```C
|
|
#define CDICT_VAL_T MyValueType
|
|
```
|
|
|
|
And so on.
|
|
|
|
## Dependency-free!
|
|
|
|
Every single used dependency may be redefined:
|
|
|
|
```C
|
|
#define CDICT_ASSERT_FN(x) my_assert(x);
|
|
```
|
|
|
|
## Flexible!
|
|
|
|
May define user data to be used in overriden functions (for example - custom allocators):
|
|
|
|
```C
|
|
#define CDICT_USER_DATA_T UserData
|
|
#define CDICT_HASHTAB_ITEM_ALLOC_FN(cdict, size) item_alloc(cdict, size)
|
|
#define CDICT_HASHTAB_ITEM_FREE_FN(cdict, ptr) item_free(cdict, ptr)
|
|
#define CDICT_HASHTAB_ALLOC_FN(cdict, size) hashtab_alloc(cdict, size)
|
|
```
|
|
|
|
## Checkout
|
|
|
|
[The library](cdict.h).
|