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