From: Russell Belfer <rb@github.com>
Date: Fri, 31 Aug 2012 23:14:35 +0000 (-0700)
Subject: Add khash foreach macros
X-Git-Tag: spawn-final~43^2
X-Git-Url: http://www.kaiwu.me/postgresql/commit/static/gitweb.js?a=commitdiff_plain;h=e65db95257bd7b46b1156cb03a8885d92cadfe5b;p=klib.git

Add khash foreach macros

This adds two convenient macros for iterating over all the keys
or all the values in a khash.
---

diff --git a/khash.h b/khash.h
index 0333510..2422044 100644
--- a/khash.h
+++ b/khash.h
@@ -531,6 +531,34 @@ static kh_inline khint_t __ac_Wang_hash(khint_t key)
  */
 #define kh_n_buckets(h) ((h)->n_buckets)
 
+/*! @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;												\
+	} }
+
 /* More conenient interfaces */
 
 /*! @function