testing new non-autotools build system

[chaz/yoink] / src / stlplus / persistence / persistent_bitset.tpp

diff --git a/src/stlplus/persistence/persistent_bitset.tpp b/src/stlplus/persistence/persistent_bitset.tpp
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+++ b/src/stlplus/persistence/persistent_bitset.tpp
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+////////////////////////////////////////////////////////////////////////////////\r
+\r
+//   Author:    Andy Rushton\r
+//   Copyright: (c) Southampton University 1999-2004\r
+//              (c) Andy Rushton           2004-2009\r
+//   License:   BSD License, see ../docs/license.html\r
+\r
+////////////////////////////////////////////////////////////////////////////////\r
+#include "persistent_int.hpp"\r
+\r
+namespace stlplus\r
+{\r
+\r
+  ////////////////////////////////////////////////////////////////////////////////\r
+  // format: data msB first, packed into bytes with lowest index at the byte's lsb\r
+\r
+  // Note: the interface does not provide access to the internal storage and yet\r
+  // to be efficient the std::bitset must be packed as bytes. Thus I have to do it the\r
+  // hard way.\r
+\r
+  template<size_t N>\r
+  void dump_bitset(dump_context& context, const std::bitset<N>& data)\r
+    throw(persistent_dump_failed)\r
+  {\r
+    size_t bits = data.size();\r
+    size_t bytes = (bits+7)/8;\r
+    for (size_t B = bytes; B--; )\r
+    {\r
+      unsigned char ch = 0;\r
+      for (size_t b = 0; b < 8; b++)\r
+      {\r
+        size_t bit = B*8+b;\r
+        if (bit < bits && data.test(bit))\r
+          ch |= (0x01 << b);\r
+      }\r
+      dump_unsigned_char(context,ch);\r
+    }\r
+  }\r
+\r
+  template<size_t N>\r
+  void restore_bitset(restore_context& context, std::bitset<N>& data)\r
+    throw(persistent_restore_failed)\r
+  {\r
+    size_t bits = data.size();\r
+    size_t bytes = (bits+7)/8;\r
+    for (size_t B = bytes; B--; )\r
+    {\r
+      unsigned char ch = 0;\r
+      restore_unsigned_char(context,ch);\r
+      for (size_t b = 0; b < 8; b++)\r
+      {\r
+        size_t bit = B*8+b;\r
+        if (bit >= bits) break;\r
+        data.set(bit, ch & (0x01 << b) ? true : false);\r
+      }\r
+    }\r
+  }\r
+\r
+  ////////////////////////////////////////////////////////////////////////////////\r
+\r
+} // end namespace stlplus\r