Import libcds.

[SXSI/libcds.git] / src / static_bitsequence / static_bitsequence_naive.cpp

diff --git a/src/static_bitsequence/static_bitsequence_naive.cpp b/src/static_bitsequence/static_bitsequence_naive.cpp
new file mode 100644 (file)
index 0000000..d9d0a0c
--- /dev/null
+++ b/src/static_bitsequence/static_bitsequence_naive.cpp
@@ -0,0 +1,70 @@
+/* static_bitsequence_naive.cpp
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * Naive Bitsequence - don't use, only for testing
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include "static_bitsequence_naive.h"
+
+static_bitsequence_naive::static_bitsequence_naive(uint * bitseq, uint len) {
+       this->len = len;
+       this->bitseq = new uint[len/W+(len%W>0)];
+  for(uint i=0;i<len/W+(len%W>0);i++)
+    this->bitseq[i] = bitseq[i];
+       uint ret = 0;
+       for(uint k=0;k<len;k++)
+               if(bitget(bitseq,k))
+                       ret++;
+       this->ones = ret;
+}
+
+static_bitsequence_naive::~static_bitsequence_naive() {
+       delete [] bitseq;
+}
+
+uint static_bitsequence_naive::rank1(uint i) {
+  if(i>=len) return ones;
+       uint ret = 0;
+       for(uint k=0;k<=i;k++)
+               if(bitget(bitseq,k))
+                       ret++;
+       return ret;
+}
+
+uint static_bitsequence_naive::select1(uint i) {
+       if(i==0) return (uint)-1;
+       if(i>ones) return len;
+       uint cnt = 0;
+       for(uint k=0;k<len;k++) {
+               if(bitget(bitseq,k))
+                       cnt++;
+               if(cnt==i)
+                       return k;
+       }
+       return len;
+}
+
+bool static_bitsequence_naive::access(uint i) {
+       return bitget(bitseq,i)!=0;
+}
+
+uint static_bitsequence_naive::size() {
+       return BW*uint_len(len,1);
+}
+
+int static_bitsequence_naive::save(FILE * fp) { return -1; }