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STLPORT/stlport/stl/_string_hash.h

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+/*
+ * Copyright (c) 1997-1999
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Copyright (c) 1999 
+ * Boris Fomitchev
+ *
+ * This material is provided "as is", with absolutely no warranty expressed
+ * or implied. Any use is at your own risk.
+ *
+ * Permission to use or copy this software for any purpose is hereby granted 
+ * without fee, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ */
+
+#ifndef _STLP_STRING_HASH_H
+# define _STLP_STRING_HASH_H
+
+#ifndef _STLP_HASH_FUN_H
+# include <stl/_hash_fun.h>
+#endif
+
+#ifndef _STLP_STRING_H
+# include <stl/_string.h>
+#endif
+
+_STLP_BEGIN_NAMESPACE
+
+template <class _CharT, class _Traits, class _Alloc>
+_STLP_INLINE_LOOP size_t
+__stl_string_hash(const basic_string<_CharT,_Traits,_Alloc>& __s) {
+  unsigned long __h = 0;
+  typedef typename basic_string<_CharT,_Traits,_Alloc>::const_pointer const_ptr;
+  size_t __len = __s.size();
+  const _CharT* __data = __s.data();
+  for ( size_t __i = 0; __i < __len; ++__i)
+    __h = 5*__h + __data[__i];
+  return size_t(__h);
+}
+
+#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION
+
+template <class _CharT, class _Traits, class _Alloc>
+struct hash<basic_string<_CharT,_Traits,_Alloc> > {
+  size_t operator()(const basic_string<_CharT,_Traits,_Alloc>& __s) const
+    { return __stl_string_hash(__s); }
+};
+
+#else
+
+_STLP_TEMPLATE_NULL struct _STLP_CLASS_DECLSPEC hash<string> {
+  size_t operator()(const string& __s) const
+    { return __stl_string_hash(__s); }
+};
+
+# if defined (_STLP_HAS_WCHAR_T)
+_STLP_TEMPLATE_NULL struct _STLP_CLASS_DECLSPEC hash<wstring> {
+  size_t operator()(const wstring& __s) const
+    { return __stl_string_hash(__s); }
+};
+# endif
+
+#endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */
+
+_STLP_END_NAMESPACE
+
+#endif