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+/*
+ * Copyright © 2007,2008,2009,2010 Red Hat, Inc.
+ * Copyright © 2012,2018 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_DISPATCH_HH
+#define HB_DISPATCH_HH
+
+#include "hb.hh"
+
+/*
+ * Dispatch
+ */
+
+template <typename Context, typename Return=hb_empty_t, unsigned int MaxDebugDepth=0>
+struct hb_dispatch_context_t
+{
+ private:
+ /* https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern */
+ const Context* thiz () const { return static_cast<const Context *> (this); }
+ Context* thiz () { return static_cast< Context *> (this); }
+ public:
+ const char *get_name () { return "UNKNOWN"; }
+ static constexpr unsigned max_debug_depth = MaxDebugDepth;
+ typedef Return return_t;
+ template <typename T, typename F>
+ bool may_dispatch (const T *obj HB_UNUSED, const F *format HB_UNUSED) { return true; }
+ template <typename T, typename ...Ts>
+ return_t dispatch (const T &obj, Ts&&... ds)
+ { return obj.dispatch (thiz (), std::forward<Ts> (ds)...); }
+ static return_t no_dispatch_return_value () { return Context::default_return_value (); }
+ static bool stop_sublookup_iteration (const return_t r HB_UNUSED) { return false; }
+ unsigned debug_depth = 0;
+};
+
+
+#endif /* HB_DISPATCH_HH */