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extern/ustl/1.5/ubitset.cc

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+// This file is part of the uSTL library, an STL implementation.
+//
+// Copyright (c) 2005 by Mike Sharov <msharov@users.sourceforge.net>
+// This file is free software, distributed under the MIT License.
+
+#include "ubitset.h"
+
+namespace ustl {
+
+/// Copies bits from \p v of size \p n into \p buf as MSB "1011001..." LSB
+/// If \p buf is too small, MSB bits will be truncated.
+void convert_to_bitstring (const bitset_value_type* v, size_t n, string& buf)
+{
+    string::iterator stri = buf.end();
+    for (size_t i = 0; i < n && stri > buf.begin(); ++ i)
+	for (bitset_value_type b = 1; b && stri > buf.begin(); b <<= 1)
+	    *--stri = (v[i] & b) ? '1' : '0';
+}
+
+/// Copies bits from \p buf as MSB "1011001..." LSB into \p v of size \p n.
+void convert_from_bitstring (const string& buf, bitset_value_type* v, size_t n)
+{
+    string::const_iterator stri = buf.end();
+    for (size_t i = 0; i < n; ++ i) {
+	for (bitset_value_type b = 1; b; b <<= 1) {
+	    if (stri == buf.begin() || *--stri == '0')
+		v[i] &= ~b;
+	    else
+		v[i] |= b;
+	}
+    }
+}
+
+} // namespace ustl