khash.h 20.9 KB
Newer Older
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
/* The MIT License

   Copyright (c) 2008, 2009, 2011 by Attractive Chaos <attractor@live.co.uk>

   Permission is hereby granted, free of charge, to any person obtaining
   a copy of this software and associated documentation files (the
   "Software"), to deal in the Software without restriction, including
   without limitation the rights to use, copy, modify, merge, publish,
   distribute, sublicense, and/or sell copies of the Software, and to
   permit persons to whom the Software is furnished to do so, subject to
   the following conditions:

   The above copyright notice and this permission notice shall be
   included in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   SOFTWARE.
*/

/*
  An example:

#include "khash.h"
KHASH_MAP_INIT_INT(32, char)
int main() {
	int ret, is_missing;
	khiter_t k;
	khash_t(32) *h = kh_init(32);
	k = kh_put(32, h, 5, &ret);
	kh_value(h, k) = 10;
	k = kh_get(32, h, 10);
	is_missing = (k == kh_end(h));
	k = kh_get(32, h, 5);
	kh_del(32, h, k);
	for (k = kh_begin(h); k != kh_end(h); ++k)
		if (kh_exist(h, k)) kh_value(h, k) = 1;
	kh_destroy(32, h);
	return 0;
}
*/

/*
49 50 51 52 53 54 55 56 57 58 59 60 61
  2013-05-02 (0.2.8):

	* Use quadratic probing. When the capacity is power of 2, stepping function
	  i*(i+1)/2 guarantees to traverse each bucket. It is better than double
	  hashing on cache performance and is more robust than linear probing.

	  In theory, double hashing should be more robust than quadratic probing.
	  However, my implementation is probably not for large hash tables, because
	  the second hash function is closely tied to the first hash function,
	  which reduce the effectiveness of double hashing.

	Reference: http://research.cs.vt.edu/AVresearch/hashing/quadratic.php

62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
  2011-12-29 (0.2.7):

    * Minor code clean up; no actual effect.

  2011-09-16 (0.2.6):

	* The capacity is a power of 2. This seems to dramatically improve the
	  speed for simple keys. Thank Zilong Tan for the suggestion. Reference:

	   - http://code.google.com/p/ulib/
	   - http://nothings.org/computer/judy/

	* Allow to optionally use linear probing which usually has better
	  performance for random input. Double hashing is still the default as it
	  is more robust to certain non-random input.

	* Added Wang's integer hash function (not used by default). This hash
	  function is more robust to certain non-random input.

  2011-02-14 (0.2.5):

    * Allow to declare global functions.

  2009-09-26 (0.2.4):

    * Improve portability

  2008-09-19 (0.2.3):

	* Corrected the example
	* Improved interfaces

  2008-09-11 (0.2.2):

	* Improved speed a little in kh_put()

  2008-09-10 (0.2.1):

	* Added kh_clear()
	* Fixed a compiling error

  2008-09-02 (0.2.0):

	* Changed to token concatenation which increases flexibility.

  2008-08-31 (0.1.2):

	* Fixed a bug in kh_get(), which has not been tested previously.

  2008-08-31 (0.1.1):

	* Added destructor
*/


#ifndef __AC_KHASH_H
#define __AC_KHASH_H

/*!
  @header

  Generic hash table library.
 */

126
#define AC_VERSION_KHASH_H "0.2.8"
127 128 129 130 131

#include <stdlib.h>
#include <string.h>
#include <limits.h>

132
/* compiler specific configuration */
133 134 135 136 137 138 139 140 141 142 143 144 145

#if UINT_MAX == 0xffffffffu
typedef unsigned int khint32_t;
#elif ULONG_MAX == 0xffffffffu
typedef unsigned long khint32_t;
#endif

#if ULONG_MAX == ULLONG_MAX
typedef unsigned long khint64_t;
#else
typedef unsigned long long khint64_t;
#endif

146
#ifndef kh_inline
147
#ifdef _MSC_VER
148 149 150
#define kh_inline __inline
#else
#define kh_inline inline
151
#endif
152
#endif /* kh_inline */
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170

typedef khint32_t khint_t;
typedef khint_t khiter_t;

#define __ac_isempty(flag, i) ((flag[i>>4]>>((i&0xfU)<<1))&2)
#define __ac_isdel(flag, i) ((flag[i>>4]>>((i&0xfU)<<1))&1)
#define __ac_iseither(flag, i) ((flag[i>>4]>>((i&0xfU)<<1))&3)
#define __ac_set_isdel_false(flag, i) (flag[i>>4]&=~(1ul<<((i&0xfU)<<1)))
#define __ac_set_isempty_false(flag, i) (flag[i>>4]&=~(2ul<<((i&0xfU)<<1)))
#define __ac_set_isboth_false(flag, i) (flag[i>>4]&=~(3ul<<((i&0xfU)<<1)))
#define __ac_set_isdel_true(flag, i) (flag[i>>4]|=1ul<<((i&0xfU)<<1))

#define __ac_fsize(m) ((m) < 16? 1 : (m)>>4)

#ifndef kroundup32
#define kroundup32(x) (--(x), (x)|=(x)>>1, (x)|=(x)>>2, (x)|=(x)>>4, (x)|=(x)>>8, (x)|=(x)>>16, ++(x))
#endif

171 172 173 174 175 176 177 178 179
#ifndef kcalloc
#define kcalloc(N,Z) calloc(N,Z)
#endif
#ifndef kmalloc
#define kmalloc(Z) malloc(Z)
#endif
#ifndef krealloc
#define krealloc(P,Z) realloc(P,Z)
#endif
180 181 182
#ifndef kreallocarray
#define kreallocarray(P,N,Z) ((SIZE_MAX - N < Z) ? NULL : krealloc(P, (N*Z)))
#endif
183 184 185 186
#ifndef kfree
#define kfree(P) free(P)
#endif

187 188 189
static const double __ac_HASH_UPPER = 0.77;

#define __KHASH_TYPE(name, khkey_t, khval_t) \
190
	typedef struct kh_##name##_s { \
191 192 193 194 195 196
		khint_t n_buckets, size, n_occupied, upper_bound; \
		khint32_t *flags; \
		khkey_t *keys; \
		khval_t *vals; \
	} kh_##name##_t;

197 198
#define __KHASH_PROTOTYPES(name, khkey_t, khval_t)	 					\
	extern kh_##name##_t *kh_init_##name(void);							\
199 200 201
	extern void kh_destroy_##name(kh_##name##_t *h);					\
	extern void kh_clear_##name(kh_##name##_t *h);						\
	extern khint_t kh_get_##name(const kh_##name##_t *h, khkey_t key); 	\
202
	extern int kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets); \
203 204 205
	extern khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret); \
	extern void kh_del_##name(kh_##name##_t *h, khint_t x);

206 207 208
#define __KHASH_IMPL(name, SCOPE, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal) \
	SCOPE kh_##name##_t *kh_init_##name(void) {							\
		return (kh_##name##_t*)kcalloc(1, sizeof(kh_##name##_t));		\
209 210 211 212
	}																	\
	SCOPE void kh_destroy_##name(kh_##name##_t *h)						\
	{																	\
		if (h) {														\
Russell Belfer committed
213 214
			kfree((void *)h->keys); kfree(h->flags);					\
			kfree((void *)h->vals);										\
215
			kfree(h);													\
216 217 218 219 220 221 222 223 224 225 226 227
		}																\
	}																	\
	SCOPE void kh_clear_##name(kh_##name##_t *h)						\
	{																	\
		if (h && h->flags) {											\
			memset(h->flags, 0xaa, __ac_fsize(h->n_buckets) * sizeof(khint32_t)); \
			h->size = h->n_occupied = 0;								\
		}																\
	}																	\
	SCOPE khint_t kh_get_##name(const kh_##name##_t *h, khkey_t key) 	\
	{																	\
		if (h->n_buckets) {												\
228
			khint_t k, i, last, mask, step = 0; \
229 230
			mask = h->n_buckets - 1;									\
			k = __hash_func(key); i = k & mask;							\
231
			last = i; \
232
			while (!__ac_isempty(h->flags, i) && (__ac_isdel(h->flags, i) || !__hash_equal(h->keys[i], key))) { \
233
				i = (i + (++step)) & mask; \
234 235 236 237 238
				if (i == last) return h->n_buckets;						\
			}															\
			return __ac_iseither(h->flags, i)? h->n_buckets : i;		\
		} else return 0;												\
	}																	\
239
	SCOPE int kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets) \
240
	{ /* This function uses 0.25*n_buckets bytes of working space instead of [sizeof(key_t+val_t)+.25]*n_buckets. */ \
241 242 243 244 245 246 247
		khint32_t *new_flags = 0;										\
		khint_t j = 1;													\
		{																\
			kroundup32(new_n_buckets); 									\
			if (new_n_buckets < 4) new_n_buckets = 4;					\
			if (h->size >= (khint_t)(new_n_buckets * __ac_HASH_UPPER + 0.5)) j = 0;	/* requested size is too small */ \
			else { /* hash table size to be changed (shrink or expand); rehash */ \
248
				new_flags = (khint32_t*)kreallocarray(NULL, __ac_fsize(new_n_buckets), sizeof(khint32_t)); \
249
				if (!new_flags) return -1;								\
250 251
				memset(new_flags, 0xaa, __ac_fsize(new_n_buckets) * sizeof(khint32_t)); \
				if (h->n_buckets < new_n_buckets) {	/* expand */		\
252
					khkey_t *new_keys = (khkey_t*)kreallocarray((void *)h->keys, new_n_buckets, sizeof(khkey_t)); \
253
					if (!new_keys) { kfree(new_flags); return -1; }		\
254 255
					h->keys = new_keys;									\
					if (kh_is_map) {									\
256
						khval_t *new_vals = (khval_t*)kreallocarray((void *)h->vals, new_n_buckets, sizeof(khval_t)); \
257
						if (!new_vals) { kfree(new_flags); return -1; }	\
258 259
						h->vals = new_vals;								\
					}													\
260 261 262 263 264 265 266 267 268 269 270 271 272
				} /* otherwise shrink */								\
			}															\
		}																\
		if (j) { /* rehashing is needed */								\
			for (j = 0; j != h->n_buckets; ++j) {						\
				if (__ac_iseither(h->flags, j) == 0) {					\
					khkey_t key = h->keys[j];							\
					khval_t val;										\
					khint_t new_mask;									\
					new_mask = new_n_buckets - 1; 						\
					if (kh_is_map) val = h->vals[j];					\
					__ac_set_isdel_true(h->flags, j);					\
					while (1) { /* kick-out process; sort of like in Cuckoo hashing */ \
273
						khint_t k, i, step = 0; \
274 275
						k = __hash_func(key);							\
						i = k & new_mask;								\
276
						while (!__ac_isempty(new_flags, i)) i = (i + (++step)) & new_mask; \
277 278 279 280 281 282 283 284 285 286 287 288 289 290
						__ac_set_isempty_false(new_flags, i);			\
						if (i < h->n_buckets && __ac_iseither(h->flags, i) == 0) { /* kick out the existing element */ \
							{ khkey_t tmp = h->keys[i]; h->keys[i] = key; key = tmp; } \
							if (kh_is_map) { khval_t tmp = h->vals[i]; h->vals[i] = val; val = tmp; } \
							__ac_set_isdel_true(h->flags, i); /* mark it as deleted in the old hash table */ \
						} else { /* write the element and jump out of the loop */ \
							h->keys[i] = key;							\
							if (kh_is_map) h->vals[i] = val;			\
							break;										\
						}												\
					}													\
				}														\
			}															\
			if (h->n_buckets > new_n_buckets) { /* shrink the hash table */ \
291 292
				h->keys = (khkey_t*)kreallocarray((void *)h->keys, new_n_buckets, sizeof(khkey_t)); \
				if (kh_is_map) h->vals = (khval_t*)kreallocarray((void *)h->vals, new_n_buckets, sizeof(khval_t)); \
293
			}															\
294
			kfree(h->flags); /* free the working space */				\
295 296 297 298 299
			h->flags = new_flags;										\
			h->n_buckets = new_n_buckets;								\
			h->n_occupied = h->size;									\
			h->upper_bound = (khint_t)(h->n_buckets * __ac_HASH_UPPER + 0.5); \
		}																\
300
		return 0;														\
301 302 303 304 305
	}																	\
	SCOPE khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret) \
	{																	\
		khint_t x;														\
		if (h->n_occupied >= h->upper_bound) { /* update the hash table */ \
306 307 308 309 310 311 312
			if (h->n_buckets > (h->size<<1)) {							\
				if (kh_resize_##name(h, h->n_buckets - 1) < 0) { /* clear "deleted" elements */ \
					*ret = -1; return h->n_buckets;						\
				}														\
			} else if (kh_resize_##name(h, h->n_buckets + 1) < 0) { /* expand the hash table */ \
				*ret = -1; return h->n_buckets;							\
			}															\
313 314
		} /* TODO: to implement automatically shrinking; resize() already support shrinking */ \
		{																\
315
			khint_t k, i, site, last, mask = h->n_buckets - 1, step = 0; \
316 317 318
			x = site = h->n_buckets; k = __hash_func(key); i = k & mask; \
			if (__ac_isempty(h->flags, i)) x = i; /* for speed up */	\
			else {														\
319
				last = i; \
320 321
				while (!__ac_isempty(h->flags, i) && (__ac_isdel(h->flags, i) || !__hash_equal(h->keys[i], key))) { \
					if (__ac_isdel(h->flags, i)) site = i;				\
322
					i = (i + (++step)) & mask; \
323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351
					if (i == last) { x = site; break; }					\
				}														\
				if (x == h->n_buckets) {								\
					if (__ac_isempty(h->flags, i) && site != h->n_buckets) x = site; \
					else x = i;											\
				}														\
			}															\
		}																\
		if (__ac_isempty(h->flags, x)) { /* not present at all */		\
			h->keys[x] = key;											\
			__ac_set_isboth_false(h->flags, x);							\
			++h->size; ++h->n_occupied;									\
			*ret = 1;													\
		} else if (__ac_isdel(h->flags, x)) { /* deleted */				\
			h->keys[x] = key;											\
			__ac_set_isboth_false(h->flags, x);							\
			++h->size;													\
			*ret = 2;													\
		} else *ret = 0; /* Don't touch h->keys[x] if present and not deleted */ \
		return x;														\
	}																	\
	SCOPE void kh_del_##name(kh_##name##_t *h, khint_t x)				\
	{																	\
		if (x != h->n_buckets && !__ac_iseither(h->flags, x)) {			\
			__ac_set_isdel_true(h->flags, x);							\
			--h->size;													\
		}																\
	}

352 353 354 355 356 357 358 359
#define KHASH_DECLARE(name, khkey_t, khval_t)		 					\
	__KHASH_TYPE(name, khkey_t, khval_t) 								\
	__KHASH_PROTOTYPES(name, khkey_t, khval_t)

#define KHASH_INIT2(name, SCOPE, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal) \
	__KHASH_TYPE(name, khkey_t, khval_t) 								\
	__KHASH_IMPL(name, SCOPE, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal)

360
#define KHASH_INIT(name, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal) \
361
	KHASH_INIT2(name, static kh_inline, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal)
362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389

/* --- BEGIN OF HASH FUNCTIONS --- */

/*! @function
  @abstract     Integer hash function
  @param  key   The integer [khint32_t]
  @return       The hash value [khint_t]
 */
#define kh_int_hash_func(key) (khint32_t)(key)
/*! @function
  @abstract     Integer comparison function
 */
#define kh_int_hash_equal(a, b) ((a) == (b))
/*! @function
  @abstract     64-bit integer hash function
  @param  key   The integer [khint64_t]
  @return       The hash value [khint_t]
 */
#define kh_int64_hash_func(key) (khint32_t)((key)>>33^(key)^(key)<<11)
/*! @function
  @abstract     64-bit integer comparison function
 */
#define kh_int64_hash_equal(a, b) ((a) == (b))
/*! @function
  @abstract     const char* hash function
  @param  s     Pointer to a null terminated string
  @return       The hash value
 */
390
static kh_inline khint_t __ac_X31_hash_string(const char *s)
391
{
Russell Belfer committed
392 393
	khint_t h = (khint_t)*s;
	if (h) for (++s ; *s; ++s) h = (h << 5) - h + (khint_t)*s;
394 395 396 397 398 399 400 401 402 403 404 405 406
	return h;
}
/*! @function
  @abstract     Another interface to const char* hash function
  @param  key   Pointer to a null terminated string [const char*]
  @return       The hash value [khint_t]
 */
#define kh_str_hash_func(key) __ac_X31_hash_string(key)
/*! @function
  @abstract     Const char* comparison function
 */
#define kh_str_hash_equal(a, b) (strcmp(a, b) == 0)

407
static kh_inline khint_t __ac_Wang_hash(khint_t key)
408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462
{
    key += ~(key << 15);
    key ^=  (key >> 10);
    key +=  (key << 3);
    key ^=  (key >> 6);
    key += ~(key << 11);
    key ^=  (key >> 16);
    return key;
}
#define kh_int_hash_func2(k) __ac_Wang_hash((khint_t)key)

/* --- END OF HASH FUNCTIONS --- */

/* Other convenient macros... */

/*!
  @abstract Type of the hash table.
  @param  name  Name of the hash table [symbol]
 */
#define khash_t(name) kh_##name##_t

/*! @function
  @abstract     Initiate a hash table.
  @param  name  Name of the hash table [symbol]
  @return       Pointer to the hash table [khash_t(name)*]
 */
#define kh_init(name) kh_init_##name()

/*! @function
  @abstract     Destroy a hash table.
  @param  name  Name of the hash table [symbol]
  @param  h     Pointer to the hash table [khash_t(name)*]
 */
#define kh_destroy(name, h) kh_destroy_##name(h)

/*! @function
  @abstract     Reset a hash table without deallocating memory.
  @param  name  Name of the hash table [symbol]
  @param  h     Pointer to the hash table [khash_t(name)*]
 */
#define kh_clear(name, h) kh_clear_##name(h)

/*! @function
  @abstract     Resize a hash table.
  @param  name  Name of the hash table [symbol]
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  s     New size [khint_t]
 */
#define kh_resize(name, h, s) kh_resize_##name(h, s)

/*! @function
  @abstract     Insert a key to the hash table.
  @param  name  Name of the hash table [symbol]
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  k     Key [type of keys]
463 464
  @param  r     Extra return code: -1 if the operation failed;
                0 if the key is present in the hash table;
465 466 467 468 469 470 471 472 473 474 475
                1 if the bucket is empty (never used); 2 if the element in
				the bucket has been deleted [int*]
  @return       Iterator to the inserted element [khint_t]
 */
#define kh_put(name, h, k, r) kh_put_##name(h, k, r)

/*! @function
  @abstract     Retrieve a key from the hash table.
  @param  name  Name of the hash table [symbol]
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  k     Key [type of keys]
476
  @return       Iterator to the found element, or kh_end(h) if the element is absent [khint_t]
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545
 */
#define kh_get(name, h, k) kh_get_##name(h, k)

/*! @function
  @abstract     Remove a key from the hash table.
  @param  name  Name of the hash table [symbol]
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  k     Iterator to the element to be deleted [khint_t]
 */
#define kh_del(name, h, k) kh_del_##name(h, k)

/*! @function
  @abstract     Test whether a bucket contains data.
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  x     Iterator to the bucket [khint_t]
  @return       1 if containing data; 0 otherwise [int]
 */
#define kh_exist(h, x) (!__ac_iseither((h)->flags, (x)))

/*! @function
  @abstract     Get key given an iterator
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  x     Iterator to the bucket [khint_t]
  @return       Key [type of keys]
 */
#define kh_key(h, x) ((h)->keys[x])

/*! @function
  @abstract     Get value given an iterator
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  x     Iterator to the bucket [khint_t]
  @return       Value [type of values]
  @discussion   For hash sets, calling this results in segfault.
 */
#define kh_val(h, x) ((h)->vals[x])

/*! @function
  @abstract     Alias of kh_val()
 */
#define kh_value(h, x) ((h)->vals[x])

/*! @function
  @abstract     Get the start iterator
  @param  h     Pointer to the hash table [khash_t(name)*]
  @return       The start iterator [khint_t]
 */
#define kh_begin(h) (khint_t)(0)

/*! @function
  @abstract     Get the end iterator
  @param  h     Pointer to the hash table [khash_t(name)*]
  @return       The end iterator [khint_t]
 */
#define kh_end(h) ((h)->n_buckets)

/*! @function
  @abstract     Get the number of elements in the hash table
  @param  h     Pointer to the hash table [khash_t(name)*]
  @return       Number of elements in the hash table [khint_t]
 */
#define kh_size(h) ((h)->size)

/*! @function
  @abstract     Get the number of buckets in the hash table
  @param  h     Pointer to the hash table [khash_t(name)*]
  @return       Number of buckets in the hash table [khint_t]
 */
#define kh_n_buckets(h) ((h)->n_buckets)

546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
/*! @function
  @abstract     Iterate over the entries in the hash table
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  kvar  Variable to which key will be assigned
  @param  vvar  Variable to which value will be assigned
  @param  code  Block of code to execute
 */
#define kh_foreach(h, kvar, vvar, code) { khint_t __i;		\
	for (__i = kh_begin(h); __i != kh_end(h); ++__i) {		\
		if (!kh_exist(h,__i)) continue;						\
		(kvar) = kh_key(h,__i);								\
		(vvar) = kh_val(h,__i);								\
		code;												\
	} }

/*! @function
  @abstract     Iterate over the values in the hash table
  @param  h     Pointer to the hash table [khash_t(name)*]
  @param  vvar  Variable to which value will be assigned
  @param  code  Block of code to execute
 */
#define kh_foreach_value(h, vvar, code) { khint_t __i;		\
	for (__i = kh_begin(h); __i != kh_end(h); ++__i) {		\
		if (!kh_exist(h,__i)) continue;						\
		(vvar) = kh_val(h,__i);								\
		code;												\
	} }

574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
/* More conenient interfaces */

/*! @function
  @abstract     Instantiate a hash set containing integer keys
  @param  name  Name of the hash table [symbol]
 */
#define KHASH_SET_INIT_INT(name)										\
	KHASH_INIT(name, khint32_t, char, 0, kh_int_hash_func, kh_int_hash_equal)

/*! @function
  @abstract     Instantiate a hash map containing integer keys
  @param  name  Name of the hash table [symbol]
  @param  khval_t  Type of values [type]
 */
#define KHASH_MAP_INIT_INT(name, khval_t)								\
	KHASH_INIT(name, khint32_t, khval_t, 1, kh_int_hash_func, kh_int_hash_equal)

/*! @function
  @abstract     Instantiate a hash map containing 64-bit integer keys
  @param  name  Name of the hash table [symbol]
 */
#define KHASH_SET_INIT_INT64(name)										\
	KHASH_INIT(name, khint64_t, char, 0, kh_int64_hash_func, kh_int64_hash_equal)

/*! @function
  @abstract     Instantiate a hash map containing 64-bit integer keys
  @param  name  Name of the hash table [symbol]
  @param  khval_t  Type of values [type]
 */
#define KHASH_MAP_INIT_INT64(name, khval_t)								\
	KHASH_INIT(name, khint64_t, khval_t, 1, kh_int64_hash_func, kh_int64_hash_equal)

typedef const char *kh_cstr_t;
/*! @function
  @abstract     Instantiate a hash map containing const char* keys
  @param  name  Name of the hash table [symbol]
 */
#define KHASH_SET_INIT_STR(name)										\
	KHASH_INIT(name, kh_cstr_t, char, 0, kh_str_hash_func, kh_str_hash_equal)

/*! @function
  @abstract     Instantiate a hash map containing const char* keys
  @param  name  Name of the hash table [symbol]
  @param  khval_t  Type of values [type]
 */
#define KHASH_MAP_INIT_STR(name, khval_t)								\
	KHASH_INIT(name, kh_cstr_t, khval_t, 1, kh_str_hash_func, kh_str_hash_equal)

622
#endif /* __AC_KHASH_H */