| /* |
| * 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 (), hb_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 */ |