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diff --git a/thirdparty/icu4c/common/locbased.h b/thirdparty/icu4c/common/locbased.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+* Copyright (c) 2004-2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+**********************************************************************
+* Author: Alan Liu
+* Created: January 16 2004
+* Since: ICU 2.8
+**********************************************************************
+*/
+#ifndef LOCBASED_H
+#define LOCBASED_H
+
+#include "unicode/locid.h"
+#include "unicode/uobject.h"
+
+/**
+ * Macro to declare a locale LocaleBased wrapper object for the given
+ * object, which must have two members named `validLocale' and
+ * `actualLocale' of size ULOC_FULLNAME_CAPACITY
+ */
+#define U_LOCALE_BASED(varname, objname) \
+  LocaleBased varname((objname).validLocale, (objname).actualLocale)
+
+U_NAMESPACE_BEGIN
+
+/**
+ * A utility class that unifies the implementation of getLocale() by
+ * various ICU services.  This class is likely to be removed in the
+ * ICU 3.0 time frame in favor of an integrated approach with the
+ * services framework.
+ * @since ICU 2.8
+ */
+class U_COMMON_API LocaleBased : public UMemory {
+
+ public:
+
+    /**
+     * Construct a LocaleBased wrapper around the two pointers.  These
+     * will be aliased for the lifetime of this object.
+     */
+    inline LocaleBased(char* validAlias, char* actualAlias);
+
+    /**
+     * Construct a LocaleBased wrapper around the two const pointers.
+     * These will be aliased for the lifetime of this object.
+     */
+    inline LocaleBased(const char* validAlias, const char* actualAlias);
+
+    /**
+     * Return locale meta-data for the service object wrapped by this
+     * object.  Either the valid or the actual locale may be
+     * retrieved.
+     * @param type either ULOC_VALID_LOCALE or ULOC_ACTUAL_LOCALE
+     * @param status input-output error code
+     * @return the indicated locale
+     */
+    Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;
+
+    /**
+     * Return the locale ID for the service object wrapped by this
+     * object.  Either the valid or the actual locale may be
+     * retrieved.
+     * @param type either ULOC_VALID_LOCALE or ULOC_ACTUAL_LOCALE
+     * @param status input-output error code
+     * @return the indicated locale ID
+     */
+    const char* getLocaleID(ULocDataLocaleType type, UErrorCode& status) const;
+
+    /**
+     * Set the locale meta-data for the service object wrapped by this
+     * object.  If either parameter is zero, it is ignored.
+     * @param valid the ID of the valid locale
+     * @param actual the ID of the actual locale
+     */
+    void setLocaleIDs(const char* valid, const char* actual);
+
+    /**
+     * Set the locale meta-data for the service object wrapped by this
+     * object.
+     * @param valid the ID of the valid locale
+     * @param actual the ID of the actual locale
+     */
+    void setLocaleIDs(const Locale& valid, const Locale& actual);
+
+ private:
+
+    char* valid;
+    
+    char* actual;
+};
+
+inline LocaleBased::LocaleBased(char* validAlias, char* actualAlias) :
+    valid(validAlias), actual(actualAlias) {
+}
+
+inline LocaleBased::LocaleBased(const char* validAlias,
+                                const char* actualAlias) :
+    // ugh: cast away const
+    valid((char*)validAlias), actual((char*)actualAlias) {
+}
+
+U_NAMESPACE_END
+
+#endif